The color change allows the folder to make some patterns appear on a paper with one color on each side. One is used for the foreground, the other one, for the background. It is typically a folding sequence related to an 'edge effect': Usually, the color cannot change on a model without crossing one edge of the paper. There are some exceptions, but as an edge of the paper is hidden, it cannot be used anymore for color change; consequently, this situation is close to the previous one. When folding a chessboard from an initial square of paper, the color changes are numerous. There are several chessboards folded from a strip of paper, or using modular origami; much less models use a unique square of paper. It is not surprising that a large square is needed for folding (without cutting) a quite small chessboard. Can a 8x8 chessboard be folded from a small square of paper? What is the smallest one?