I'm using Timeular which is an octahedron with erasable sides. It tracks whichever side is facing up. You just have to remember to flip it, which is a good way

I'm using Timeular which is an octahedron with erasable sides. It tracks whichever side is facing up. You just have to remember to flip it, which is a good way to notice 'hey, should I really be switching tasks'?