Can you not hack together something to create a 'floating' keyboard? In other words a beams of light shine down each letter (forming a complete keyboard) and th

Can you not hack together something to create a 'floating' keyboard? In other words a beams of light shine down each letter (forming a complete keyboard) and then a receiving mat (or possibly bounce back sensors in the head unit?) and any beam interuption/change of state registers as a keypress, so in effect 'air typing' a bit like the musicians of the 70's and 80's playing laser keyboards Eg https://www.youtube.com/watch?v=GPWr9bitVek https://www.youtube.com/watch?v=GPWr9bitVek A Quick bit of research turned up this https://www.youtube.com/watch?v=wBS8ZEPdiM8 https://www.youtube.com/watch?v=wBS8ZEPdiM8 (Laser Projection Keyboard Review - Geeky Stuff) My adaptations are an ergonomic 'split and curved' keyboard and a mouse similar to the Logitech M575 Ergo.