Paper × 841 mm). A1 is half the size of a sheet of A0 (i.e., 594 mm × 841 mm), such that two sheets of A1 placed side by side are equal to one sheet of A0. A2 is half the size of a sheet of A1, and so forth. Common sizes used in the office and the home are A4 and A3 (A3 is the size of two A4 sheets). The density of paper ranges from for tissue paper to for some speciality paper. Printing paper is about . Paper may be classified into seven categories: Some paper types include:
Paper craft Paper craft Paper craft is the collection of art forms employing paper or card as the primary artistic medium for the creation of three-dimensional objects. It is the most widely used material in arts and crafts. It lends itself to a wide range of techniques, as it can for instance be folded, cut, glued, molded, stitched, or layered. Papermaking by hand is also an important paper craft. Painting and calligraphy though they are commonly applied as decoration are normally considered as separate arts or crafts. Paper crafts are known in most societies that use paper, with certain kinds of crafts