The Corpus Clock is at base a gratuitous display of wealth and pretentiousness; but grousing aside the main problem with it is that there is always such a crowd watching it that I haven’t been able to get a decent picture of it. It has been around for a little while, but I’ve only just noticed. The doorway it is in used to be that of the Gnatwest bank, which used to be useful. Now Corpus have taken it back to be a library so the public doorway was redundant.
The wiki article will point you at the right links if you care (and it seems as though they too can’t get a decent picture). I like the grasshopper, since it has a grasshopper escapement. Amusingly, for something that is supposed to remind us of the passing away of time, the cam.ac.uk page about it points you too a rotted page at Corpus. Ah well, mundus transit et textura eius.