My idea is to make a totem like toy (ToYeM). You can rotate each block and it can emmit light. When the blocks are alligned the right way the light will turn on.
Must: Blocks turning. It must emmit light.
Should: When you turned the ToYeM the right way it emmits light.
Could: When you turn a block a different collor is emmitted.
Won't: Detachable blocks.