Earliest map fold
In the City Museum, Milan, is a map dating from ancient Egyptian
times, which has crease lines showing it was folded in a similar way to modern
maps. Complete Origami, Eric Kenneway, page 106.
Earliest published module
Soong gave diagrams for folding a Chinese pagoda bookmark using 9 squares of
different sizes but all folded in exactly the same way. The diagrams were in
a book titled The Art of Chinese Paper Folding published in 1947 by The Worldís
illustration of an origami model
Sphaera Mundi, by Johannes di Sacrobesco,
1490, Venice, has an illustration of an Eclipse of the Sun and on the sea are
shown two classic paper boats.
Earliest letter folds in Europe
In Envelope and Letter Folding, third edition, page 4, edited by John Cunliffe,
an illustration is given of a letter fold, dated 1670, from the Netherlands.
Koshiro Hatori reported on Internet that in Ram-ma Zushiki (Designs
for Ram-ma) published in 1734 there are two cubes which are modular models.