Strength Issue:I love the idea, but this is by far the most frustrating puzzle I have ever solved. The black that serves as the base for the whole puzzle is very thin and the pieces don't snap together and the completed part sort of wobbles as you proceed with the image. I have a hard time just picking up the individual pieces from the table. Some pieces have a very small joints and damage easily. I think the idea is perfect, but it needs some improvements like larger joints and thicker base like 1-1,5mm