unstable surfaces

La Jolla, California, 2007Now, here's an example of the ground beneath one's feet being completely ambiguous, certainly mysterious: how deep is the slump beneath this sink hole?  Is it at the level of the water table, or the aquifer, or a mile deep?  This photo looks like something by Jeff Wall: a small suburban crisis.

If you click on the picture it will take you to a Guardian photo series of other, recent sink holes.