- What’s the name for those fine, moiré-looking swirls often found on banknotes? Guillochés, it turns out. Aegir Hallmundur features a nice set of them, plus info on how they were created. See also his Future of Money designs. [Via]
- The folks at the GigaPan project provide close-ups of guillochés, pennies, and much more with their new giant close-ups. Here they demonstrate photographing a circuit board: