This is weirdly lovely. The Last Clock is a software timepiece, with three rings composed of a video taken from a live feed. The outer ring is the second ring; the middle one is the minutes, and the innermost the hours. The clock is thus, as the creators explain, "a record of its own history." More:

As the hands rotate around the face of the clock they leave a trace of what has been happening in front of the camera. Once Last has been running for 12 hours, you end up with an easy-to read mandala of archived time.

That clock above was composed of images from a building in Taichung, Taiwan. Not terribly practical, but, like the Clock of the Long Now, a neat way refiguring how we think about time and our relationship to it.

(Thanks to the J-Walk blog for this one!)