I'm not sure how a glass surface would work given how lasers interact with glass. But this style of keyboard has been done in various forms as far back as '92.

I'm not sure how a glass surface would work given how lasers interact with glass. But this style of keyboard has been done in various forms as far back as '92. They're awful. https://en.wikipedia.org/wiki/Projection_keyboard https://en.wikipedia.org/wiki/Projection_keyboard