An LCD-picture frame, but with the addition of some mecury tilt-switches which would be used to adjust the rotation of the picture being displayed.
If the frame was not hanging straight - at least the picture would be !
(And clipped diagonally....doh !)-- monojohnny, Jul 27 2006 This is just a workaround - why not a self-levelling frame? Would save all that fussing about with tape measures and spirit levels.-- DrCurry, Jul 27 2006 Circular frame?-- st3f, Jul 27 2006 Self levelling frame has been done before.-- methinksnot, Jul 27 2006 [DrCurry] - I was worried that a self-leveling frame pitted against a frame tilter would result in burned out electric motors all over the place :-)-- monojohnny, Jul 28 2006 random, halfbakery