disappearing switch

Job ID: 30999270

Budget: $30 – $250 USD

I don't have a business just yet. I came up with an idea and I would like too "get 'er done"!
I need a white line around an inch maybe an inch and a half. I want to press it and it disappears and shows the black background. I do not want it to be electrical.

I have already come up with having a thumbwheel with half black and half white.
I have already come up with having tiny "door slides".
I have already come up with having long nuts on all thread and spinning them around to expose the black.

I am looking for a way, like a clicker on a pen, that you press and it spins around so you can't see the white side.

The objective is to press it white and black like on and off.