Last clock is an ambient display that paints a visual memory of the last 60 seconds, the last 60 minutes and the last 12 hours in an never-ending loop. Available for iPad. http://www.lastclock.newmediology.org
use it in your browser at: http://lastclock.net (either Chrome or firefox, no Safari)
UPDATE : iPhone/iPad versions currently broken due to OS update. we're fixing it..