Indeed they are, but why not share a how to with people.
- Objetct to pain on
- masking tape
- 1 or 2 paint colors.
Afterwards do the framing with masking tape, this will serve to have somwhere to put guide marks with your pencil, making it easier to do the squares afterward, and this marks well, i tried to do the normal squaring on the laptop, but you can do any kind of checkerboard you may want