Blue could also mean dark green, violet, black or brown. The ancient Greek word for a light blue, "glaukos", also could mean light green, grey, or yellow. The Greeks imported indigo dye from India, calling it indikon. They used Egyptian blue in the wall paintings of Knossos, in Crete, (2100 BC). It was not one of the four primary colours for Greek painting described by Pliny the Elder (red, yellow, black, and white), but nonetheless it was used as a background colour behind the friezes on Greek temples and to colour the beards of Greek statues. The Romans also imported indigo
Of the Blue Colour of the Sky in producer Dave Fridmann's Tarbox Road Studios, a converted Amish barn in Cassadaga, New York, through May the following year. Bassist Tim Nordwind described the process of the studio sessions as a midpoint between the slick production work done on "OK Go" and the emphasis on live takes with the recording of "Oh No". "Of the Blue Colour of the Sky"'s accompanying booklet presents the album as a concept based on an unnamed passage from "The Influence of the Blue Ray of the Sunlight and of the Blue Colour of the Sky" by General A.J. Pleasonton. The title of this