My studio had a very hilarious White Elephant gift exchange today. I was lucky to get one of the hottests gifts - a slide rule! I became fascinated with this mysterious and cool-looking gadget, wondering how it works. Looks very complicated to me. It is the ancestor of today's electronic calculator.
I later found out it was from Fred, a principal of NBBJ, who sits next to me :) He used that in college, which was 40 years ago! The rule is still in good shape. To me, it is a very precious gift from an older generation, seeing how drastically architects' work style has changed due to the advancing technology.