On V4 he flipped the optical sensor around, embedding it in the controller, with a small circular “mouse pad” attached to his thumb. The concave surface was made from the diffuser of a large ...

Most gaming laptops have similar basic features: a clamshell form factor, a keyboard (sometimes mechanical), a big touchpad .

and then slide across the surface like a mouse on a mouse pad. If you look closely, you can even see something that looks like a slider pad on the bottom of one of the connectors, leading further ...