This is designed to hold your paints as you are working on them, whether it be a lot of colors or mixing some colors. Each rounded area will hold your paint from mixing or spilling. The inner circle holds your water to rinse your brush off. Inside of this is a ridge to squeeze excess water off your brush.

I recommend a 0.16 or 0.12 layer height as it gives smoother curvature of the paint areas, and tree support (auto) for the paint brush brim inside the larger water cup.