The bottom "Flipper" is a counter, displayed in base 10. For the top "Flipper" choose the base (2, 4, 8,10 or 16) to display. The tiny numbers represent that place's value. That is, for base 10, the one's place, the ten's place, the hundred's place, and so on. This can be thought of as 10^0, 10^1, 10^2, 10^3, etc. In bases two, they are the one's place, the two's place, the four's place, the eight's place, and so on. This is like 2^0, 2^1, 2^2, 2^3, and so on. See the original project for some more detail.
Thanks to @Fun_Random_Games for the bulk of the code. I think the animation (number "Flipping") is brilliant. I simply added an extra digit and added the ability to do Base 16 (Hex). I also decided to limit the base options to the ones most commonly used.