First we got a travel version of this Fractiles mosaic – 96 pieces on a small black board (20×20 cm). The camping kit was bought for the eldest daughter. A little later, they bought an identical kit for the middle one – she was 3.5 years old back then. They took mosaics with them everywhere – 96 rhombuses of 3 colors saved them from boredom during long trips and trips to the doctor. When the younger daughters grew up, the eldest got another version with a large board. You can assemble mosaics on any other surface, but black boards are still more attractive and contrasting. We also use them are for other magnetic mosaics. The details are thin – 1mm, there are 3 sizes and 3 colors – rhombuses of red, yellow and blue colors.