Composing plane for two-sided puzzles

Claim 1

A composing plane for containing the playing pieces of a two-sided puzzle, comprising: first and second planar sheets; each sheet having a generally rectangular four-sided configuration and formed from a transparent material; first longitudinal sidewall means provided on one surface of each of said first and said second sheets for containing the pieces of the puzzle; said first longitudinal sidewall means formed generally along and spaced inwardly from the perimeter of at least two sides of each of said first and said second sheets; second longitudinal sidewall means spaced from and extending generally in a direction parallel to said first longitudinal sidewall means along at least two contiguous sides on the surface of each of said first and said second sheets; said first longitudinal sidewall means and said second longitudinal sidewall means forming a continuous elongated cavity on the surface of at least one of said first and said second sheets for providing complimentary engagement with the first longitudinal sidewall means located on at least the other of said first and said second sheets; spring means for fastening said first and said second sheets in a closed position; and at least one through hole for engagement with a supporting member for displaying said composing plane; said through hole being provided at a point proximate the outer perimeter of at least one of the sides on each of said first and said second sheets.