This is a cool concept. The one problem that I had, is that it is difficult to tell which cubes the numbers are paired with. I think that it would be more intui

This is a cool concept. The one problem that I had, is that it is difficult to tell which cubes the numbers are paired with. I think that it would be more intuitive if the numbers were printed/etched into each face of the cubes (like dice, but with normal numbers).