Light-emitted keyboards

Technologies that failed. There' s room for Light-emitted keyboards, too. Reason? "we tend to need visceral feedback as we type". From Techradar.com:

>>12. Light-emitted keyboards

If video goggles fail because our human perceptions of video have a hard time understanding two discrete worlds, then light-emitted and roll-up flexible keyboards have a similar "physical world" limitation – we tend to need visceral feedback as we type.

Interestingly, your typing speed is faster on the iPhone when the device provides a click-click audio accompaniment.

"Touchscreen keyboards have generally been more successful when they have added the sound of keys clicking," says King.