the following discussion describes in detail two embodiments of the invention and several variations of these embodiments . this discussion should not be construed . however , as limiting the invention to those particular embodiments , practitioners skilled in the art will recognize numerous other embodiments as well . for definition of the complete scope of the invention , the reader is directed to appended claims . turning now descriptively to the drawings in which similar reference characters denote similar elements throughout the several view . fig1 through 7 illustrate the first embodiment of the window curtain covering assembly of the present invention indicated generally by the numeral 38 and consists of a combination of a series of parallel regularly spaced louvers 40 made of semi opaque , or opaque flexible fabric material such as woven , non - woven , knitted , or stitched bonded fabric , and curtain wall sections c made of transparent or translucent flexible material such as sheer cotton , sheer nylon , lace , thermoplastic and combinations thereof . the louvers 40 and curtain wall sections c having the same length . the louvers 40 having a width designated d 1 measured from the curtain wall sections c to the distal end of the loop 44 and is about the same or greater than the distance between adjacent louvers designated d 2 as shown in fig1 such that each louver overlaps a subjacent louver when the curtain 38 is in the closed position as shown in fig4 and 7 . in this position the louvers 40 which are made of semi opaque fabric overlapping each other will decrease the transmission of light through to the room , and when the louvers made of opaque fabric will substantially block the transmission of light through to the room . in the open position of curtain 38 shown in fig1 and 6 the curtain wall sections c limits the space between adjacent louvers 40 by the distance d 2 and is completely visible which permitting the transmission of light through the room , in this position the louvers 40 and the curtain wall sections c are arranged in relation to one another as to form a combination of continuous assembly of alternating louvers 40 and curtain wall sections c respectively . for closing the curtain 38 the louvers 40 may be moved either to the left fig2 or to the right fig3 from the open position shown in dot - and - dash lines , so that they will then occupy a position in which the curtain 38 is half open or half closed respectively . with the louvers 40 in the open position shown in fig1 the entire curtain 38 can be retracted in the known manner as shown in fig5 to form a stack of louvers , in this position the curtain wall sections c are completely concealed by the louvers . fig8 shows a louver 40 being independently formed by folding a strip of the semi opaque or opaque flexible fabric material back upon itself longitudinally so as to define a single loop 42 that extends from one side only of the curtain wall section c and opposed faces of each loop are connected together with the curtain wall sections along vertical seam s parallel to and spaced from the distal end 44 of the loop 42 to form a pocket 46 in the loop . the seams s preferred to run from behind the curtain wall sections c , by doing that the curtain wall sections will curve forwardly between the adjacent louvers 40 as shown in fig9 . when the entire curtain 38 moved to the retracted position in the known manner to form stack of louvers 40 , in this position the curtain wall sections c are curved forwardly and completely concealed by the louvers 40 as shown in fig1 . the seams s can be formed in any desired manner , for example by ultrasonic welding when the curtain wall sections c is formed of synthetic fibers or a blend of synthetic and natural fibers , or by heat sealing if the curtain wall sections is formed of a thermoplastic material . the seams can also be formed by use of suitable adhesive or by sewing . however , the practitioners skilled in the art will recognize the suitable right way to form the seams . fig1 is showing a shaping means of thin strip of plastic material 48 having sufficient width and is formed with a single loop by folding the strip of plastic upon itself width wise . thus defining opposed faces made smaller than the opposed faces of the loop 42 so it can be attached to the inner edge of the top portion of the pocket 46 by using adhesive ( shows as a shaded area ) and end before the seam s to allow the passage of the stitches or adhesive to go through to the top end of the louver 40 . the thin strips of plastic 48 having a hole 50 in about the central of there opposed faces and can conveniently be formed in the opposed faces by punching . the area around the hole 50 left unattached ( shows as non shaded area ) to allow for the hook 52 to be adapted to the hole as shown in fig1 so that the thin strip 48 and the bottom portion of the hook 52 are hidden inside the pocket 46 as shown in fig1 . the shaping means 48 also can be attached to the pocket 46 by making a hem in the inner upper end of the loop 42 by extending the material in length at the upper end and then folding the extension back upon itself to keep the louvers 40 and curtain wall sections c at the same length . then insert the shaping means 48 into the hem and make holes in the inner part of the hem so it will fit over the holes 50 in the shaping means . the hem could be stitched or glued . fig1 , 15 , and 16 are showing the louvers 40 in the curtain 38 suspended in a track 54 anchored horizontally to wall w by brackets 56 located above the top of the window frame f . the track 54 contain a number of sliding carriers ( not showing ) together with a mechanism 58 that can be controlled in the conventional fashion by elongated cable 60 for shifting the louvers to their various positions opened , closed and retracted positions respectively . each carrier having a hook 52 adapted to extend downwardly from the carrier . the carriers ( not showing ) and the shifting mechanisms are well - known in the art and do not constitute a part of the present invention . fig1 and 18 showing a perspective view and an end elevational view for the material fastener respectively . the material fastener t includes a back wall b , a first wall a 1 and a second wall a 2 . the first wall a 1 and the second wall a 2 are parallel to each other and are spaced apart . they protrude from the back wall b . the material fastener t further include one or more thin slats n which extend from inside surfaces of the first and second walls a 1 and a 2 of the material fastener t . the thin slats n can be inwardly angled and preferably overlap each other to firmly secure the opposed faces of the louvers 40 along with the curtain wall sections c as shown in fig1 . preferably the material fastener t is made of a more rigid thermoplastic and the thin slats n are made of a more resilient thermoplastic . fig2 shows a louver 40 being independently formed by folding a strip of the semi opaque or opaque flexible fabric material back upon itself longitudinally so as to define a single loop 42 that extends from one side only of the curtain wall section c and opposed faces of the loop are connected together along a vertical seam m parallel to and spaced from the distal end 44 of the loop 42 to form a pocket 46 ; the curtain wall section c and louver 40 secured at their top portion only within a material fastener t having a sufficient length . in this arrangement the upper end of the curtain wall section c is preferably folded over upon itself and stitched , bonded along its entire face to provide a hem having the same length as the material fastener , to help maintain and stiffen the outward facing . also the lower end of the curtain wall section c could be folded over upon itself and stitched , bonded along its entire face to provide a bottom hem ( not showing ). the seams m can be formed in any desired manner . for example by ultrasonic welding or by bonding the seams can also be formed by use of suitable adhesive or by sewing . however , the practitioners skilled in the art will recognize the suitable right way to form the seams . fig2 shows two adjacent louvers 40 in open position along with curtain wall sections c secured within material fasteners t respectively along their entire length . the thin slats n firmly secure the louver 40 and the curtain wall section c and retard there removal , by securing the louvers 40 and the curtain wall sections c within the material fasteners t , the curtain wall sections c will curve forwardly between the adjacent louvers . when the entire curtain 38 moved to the retracted position in the known manner to form stack of louvers 40 , in this position the curtain wall sections c are curved forwardly and completely concealed by the louvers 40 as shown in fig2 . fig2 - 25 showing the two sheets of flexible fabric material divided to a plurality of strips having the same length . first strips made of semi opaque or opaque fabric p 1 . the strips of first sheet having a width designated d is about double or greater than the width of the strips of second sheet ( curtain wall sections c ) designated d 2 as shown in fig2 . and by providing one strip of first sheet and positioning it so that the left edge portion and right edge portion overlaps the adjacent edge portions of strips of second sheet longitudinally and doing this with repetition and by attaching them together along vertical seam s 1 along the length of the overlapping of adjacent portions as to define a combination of continuous assembly of alternating semi opaque or opaque strips and transparent or translucent strips . by folding the strips of first sheet p 1 upon themselves longitudinally so as to define single loops 42 that extend from one side only of the strips of second sheet p 2 ( serve as curtain wall sections c ) and opposed faces of each loop are connected together along vertical seam s 2 parallel to and spaced from the distal end 44 of the loop to form a pocket 46 in each loop ( p 1 will serve as louvers 40 ) as shown in fig2 . the edges of seam s 1 is inserted between the opposed faces of the loop 42 so the seam s 2 will hide the edges of seam s 1 to give a clean and finish look for the window curtain covering 38 . the curtain wall sections c limits the space between adjacent louvers 40 by the distance d 2 as shown in fig2 . the seams s 1 and s 2 can be formed in any desired manner as the examples mentioned here before . the strips p 1 and p 2 could be pre fabricated of pre selected colors and designs to ease the production of the present invention of window curtain covering 38 . fig2 and 27 is actual colored photocopy of the first embodiment in accordance with the present invention in an open and closed position respectively . it shows the louvers 40 in the curtain 38 suspended in a track 54 anchored horizontally to wall ( not showing ). the tracks 54 contain a number of sliding carriers ( not showing ). each carrier having a hook 52 adapted to extend downwardly from the carrier . second embodiment of the present invention which the window curtain covering 138 is formed with a u - shape loop , as shown in fig2 - 30 where in , the semi opaque or opaque fabric strips are about three times larger in width than the transparent or translucent curtain wall sections c 10 . in this arrangement the semi opaque or opaque strip folded upon itself to form a loop 142 and the opposed faces of the loop is parallel to each other and having shaping means of thin strip of plastic having holes 150 in the top portion of each side of it and in about the central of its sides . the opposed faces of the loop 142 being attached to the transparent or translucent material along vertical seams e a pre selected distance d 4 which keeps the opposed faces of the adjacent loops always parallel to each other and to form curtain wall sections c 20 between the opposed faces of each loop , also forming a pocket 146 in the loop . the curtain wall sections c 10 will limit the space between adjacent loops 142 by the distance d 3 which is about the same width as the width of the opposed faces of the loops d 5 which measured from the curtain wall section c 10 to the distal end 144 of the loop . each side of the loop 142 adapted to hang vertically from adjacent hooks 52 in fig3 . fig3 shows the curtain wall sections c 20 being narrowed down to c 40 so the distance d 4 in fig2 became less to a pre selected distance d 40 which makes the opposed faces of the loop 162 more closer to each other . in this condition the curtain wall sections c 10 shown in fig2 will increase in width to c 30 which is shown in fig3 . this will increase the transmission of light through the room when the curtain is in open position . by doing that the distance d 3 and d 4 added together in fig2 will remain the same as the distances d 30 and d 40 added together in fig3 .