I've used sit-stand desks for a while, and one of the big issues I have is that you have to break concentration to operate the thing. It sounds trivial, but when you're focused on something it's hard to take 15+ seconds to push a button while the desk slowly rises.
So I made this "robotic" face-tracking desk. The concept is that it moves with you in an analog way, so it's always at the optimal position without having to adjust anything.
I still had the lifting mechanism from the bicycle project. I took that apart and re-purposed the linear motion components to make a crude prototype.