This is a test for a data visualization of money that is recorded on a spending sheet.
I put actual amount of money on the sheet. And red lights indicate what rows are responsible for it.
Toward the end of the stack, the array a little bit bends over because the bills are copied along with a skewed curve which grows out of the sheet.
A drawback of it is lack of axis. You see how it cost roughly, but you cannot conceive and compare each bill tower exactly.
It is the behind the scene of it.