It is clear that medieval artisans used a compass and a straightedge. According to modern theories the production of a rather limited set of girih tiles is considered, too. Broug makes it easy on one hand to comprehend the construction step by step. But he also gives an immediate impression of the incredible skills necessary to really create a piece of art. The CD provides further examples and also shows the real buildings in the Islamic world where these marvels can be found.
Lacking compass and straightedge nowadays, I immediately tried to use Powerpoint for the first few squared patterns; and succeeded within minutes.
First published at Salmiya.