Jigsaw puzzle fans rejoice! Niggli.puzzle, designed by the seminal Swiss graphic artist Moritz Zwimpfer, is a diabolical challenge for the eye. Unlike traditional jigsaw puzzles, Niggli.puzzle features only two forms: square and circle. What's more, all five puzzles in this wonderful collection are somewhat abstract photos of similar forms repeated many times with only small variations. For lovers of contemporary art, there's another plus: unlike the banal museum reproductions and landscapes used for most jigsaw puzzles, these edgy photos are so handsome that the finished puzzles would not look out-of-place framed on your wall. Heavy-duty cardboard, razor-sharp reproductions, in a slipcover.