What is this curious cube?
It's a note pad! This is one of those note pads which are quite thick, and have printed sides, but not printed sheets. However, if you use too many pages, the designs will dissappear. This cube is from Segaworld. As you can see, it has Sonic, Tails Robotnick and Sally on each of it's 4 sides. Sonic & Sally look great, but Robotnick is looking quite stupid (the opposite of what he's supposed to be) and the Tails art has sufficiently mutated by this point to look like the AoStH version, but at least he is orange here and not brown.