Riddle twelve

Riddle twelve: Mathematical Art

Difficulty: 9
Interest: 7

Take out your calculator and favorite paint program, and follow the instructions. It's not as easy as it looks, but with perseverance, you should be able to do it.

You need four words which will lead to the solution after a little wikipedia or google search.

Next Level

*Spoilers*

One of the four words might not be familiar, as it is actually the name of a piece of art. Once you spell it right, the answer is obvious.

You have to draw a circle to find the letters. It might be hard to get it right though, and you have to read them counter-clockwise. This one really isn't easy.