Kevin Sadler wrote about it:“This puzzle remains unsolved for me. It is another of those anti-slide puzzles that Dr Latussek has created where the pieces fit easily into the box but that is not the challenge. The beautiful Zebrano pieces are Soma cube shapes where every single cubie in each piece has been cut in half before being put together. It arrives with all but one placed and a nice smooth surface on show. The aim, very like the previous Shrinking Soma, is to assemble all the pieces into the Pink oak box so that the smooth surface is flush with the top and, despite there being many gaps underneath, none of the pieces will slide at all or drop down to a lower level. I am just about able to assemble shapes but creating assemblies that won't allow pieces to move is a logical arena that I just cannot seem to comprehend. It is beautifully made and well worth adding to your collection if you are seeking a seriously difficult challenge.” Material: Pink Oak / Zebrano