||1946, at Madison, Wisconsin.
||40 inches high at the back, 33 at the front, 36 inches across the top.
||The blocks are Brazilian rosewood and Pernambuco, mounted on thin foam rubber; the resonators are Brazilian bamboo.
||The 36 blocks are arranged in diagonal rows, so that one sweep of the mallet will sound an arpeggio-like chord. Strokes with the right hand are major; those with the left hand are minor (from top to bottom). The range is almost three octaves, beginning with the approximate C# above middle C.