There is no royal road to geometry, but there is one to geeky fashion: just wear this Euclid watch!
In Euclid's Elements Book 1, Proposition 1, the geometrician stated that you can make an equilateral triangle with any straight line. The Euclid watch proves this proposition twice a day, every day!
Don't believe it? Just watch the geometric shapes of the Euclid watch dials as it spins round and round. It's the perfect watch for your beloved geek.