That takes me back! I received a vectrex as a small child, as a discarded toy from my (richer) cousins. The graphics were pretty different to anything I'd see

That takes me back! I received a vectrex as a small child, as a discarded toy from my (richer) cousins. The graphics were pretty different to anything I'd seen before, being vector based, but it was a nice device because it meant I didn't need to hog the family TV. Their approach for improving the graphics, by providing colour via a transparent overlay was inspired, and lots of fun. My overriding memories of the device are the long-thin controller, which used to be clipped beneath the screen when not in use, tethered by a curly-cable, and the overlay system.