Yep, the mathematical squares/cubes/etc. They'd make great album covers, especially if it's just the shape that gets exported, not the X/Y/Z axes (axis plural). Similar to the image I've attached. 
Yep, the mathematical squares/cubes/etc. They'd make great album covers, especially if it's just the shape that gets exported, not the X/Y/Z axes (axis plural). Similar to the image I've attached.