Thru and Thru by Alan Warner: scarce 1974!

From his painted line of props in 1974!  Difficult to find!

Based loosely on an Massey effect, two sheets of plastic (one black and one white) are placed in a wooden frame and a shoelace threaded through the corresponding holes to lock them in place.  The spectator chooses a color of one of the locked in sheets.  At the magician’s command that color rises out of the frame freeing itself from the other sheet in the frame!  An early one not easy to find! Like new!