Reuleaux triangle and fashion and motorcars and DIY

There was this recent entry on kottke about the reuleaux triangle. Basically it's an equilateral triangle with equal curvature and radius from each vertex. By the time you understand what that meant, you'd need to rest your head.

Well, Liz Claiborne happens to use this triangle as a logo. I can't find one online so you have to go to a Liz Claiborne store (eg. Raffles City branch) and see the logo. Not you'd be interested.

The triangle forms the basis of the legendary rotary engine. Speak to guys into cars and they'll tell you about Mazda RX series. Why? Because they are the remaining mass manufacturers of the rotary engine. Also known as the Wankel engine.

Because of it's unique property of being able to rotate within a square, they are used to drill square holes.