DataGlyphs/Microglyphs are a robust and unobtrusive method of embedding computer-readable data on surfaces using tiny 45-degree diagonal lines representing binary 0 or 1. The article details how data is encoded, data density compared to PDF417 barcodes, factors affecting density (resolution, error correction, data compression, overhead), and licensing information.
A method called location arithmetic, first described by John Napier in 1617, uses a checkerboard to perform various mathematical calculations, including multiplication, division, and taking the square root, by breaking numbers into their binary equivalents and moving markers around the board.
