The Autonomous Desk is a desk that can be used for either sitting or standing, and will even notify you if you've been sitting or standing for way too long.
The desk comes with a preset training plan that starts off by suggesting that users stand for 20-30 minutes at a time, before gradually increasing the suggested standing time each day. The desk can also learn users' sitting and standing habits and adjust suggestions accordingly.
Sitting for long periods of time while working has been all but proven to be really bad for you, but standing for too long isn't good for you either. The difficulty with typical standing desks is knowing when you've been standing for too long. That's one question mark that the Autonomous Desk gets rid of.