This Puzzle is based on an Islamic interlace design and has just 18 pieces. The frame extends into the puzzle in several places (the isolated section at the bottom of the picture is an example). This begins the pattern, and engraving on the base continues the design to help in the solving process. This engraving doesn't give away the solution because each piece will fit in many places throughout the pattern. The cherry wood pieces hold each other in place, but there is a lot of space between them which reveals the contrasting base.
If this puzzle were made at about 18 cm across, then 8 puzzles could be fit per P3 size board. With a 4mm Italian Poplar base and 10mm American Cherry MDF pieces and frame, the cost of the wood would be about $5.14 per puzzle.