A projector drone that follows its user

A projector and a camera is attached to a drone. The camera tracks the viewer. The projector shows videographic entertainment on the wall that the user is most likely to be looking at.

A projector drone that follows its user

A fast-food restaurant with exit treadmills

A self-driving recreational vehicle

Buying Kindle books at the physical bookstore

An app that makes your phone worse as you gain weight