A rainbow is hiding in the white sky. It may be a normal rainbow like the one above — or one where the colours swapped places.
Pick a colour. Touch where you think it hides.
If you're right, a splash of paint appears — and your splashes grow bigger and bigger! If you're wrong but still found a bit of the rainbow, a smaller splash of paint is added to the rainbow.
Paint the whole rainbow in as few touches as you can.