You've got your Form Follows Function, but there's also the more interesting (if less alliterative) Designer Follows Tool. London-based furniture designer Max Lamb discovered a tool set for tapping and threading wood, then set about figuring out what he could use it to make. The result is his Round and Round Table:
A less imaginative designer (by that I mean, me) would've simply used the tool to create attachment points for four legs and a table, reducing the act of screwing, as it were, to a one-time event. I dig that Lamb used the tool to make his table dynamic, functional and interactive.
Speaking of tools, I admit I was drooling over the Festool router and chop-saw in the video before I even noticed the object being built, or registered that it was Max Lamb. We've been looking in on the guy every so often since 2006, and you can view more of his work here.