Mess: The Manual of Accidents and Mistakes.
1. Select a series of ten colors in any medium.
2. Fill in each square in this grid in some kind of regular sequence.
3. Insert a mistake somewhere.
I planned to create a grand and obvious mistake, however fate intervened.
When I was drawing the colored lines, I made a mistake in the color series. Oops! So I went with the accidental mistake as opposed to creating an intentional mistake.
Can you see my mistake?