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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

At that point, Steve was just starting to kill all the “moonshots” and “cool tech but who is really going to buy it” products like the Newton and OpenDoc. Even if he read the email, there’s no way he’d be interested in something like that at the time.

In 2010 I emailed Steve Jobs about an idea for improving iWork 09. I forgot what it was. No reply ever.

Did you get a reply?

and? did he reply?

Yes, "thanks," from NeXTmail.