Spirited performance

Crooked pictures can drive you mad. But hanging them straight is a pain,
because it is well nigh impossible to hold the frame in one hand and a spirit
level in the other while marking the fixing points. But Jimmy Csanyi of Las
Vegas has the answer. His idea (WO 98/24085) is to put a spirit level in the
picture frame. Hidden within a recess on the top of the frame, it is easy for
the fitter to see, but invisible from ground level.