Algodoo

Higher manitude digits (rows) are stacked on top of the lower magnitude digits; each column from left to right is a number.

Vertically are the magnitudes of each digit, progressing through the powers of 2, and horizontally are the resultant represented number.

For example, if 2, 4, and 8 are WHITE and the rest BLACK, then add those together; 14. For more information, look up base-2 mathematics.