Imagine travelling inside a ship or submarine. Many crew members spend a lot of time actually submerged.
Today’s invention attempts to give them a greater sense of their position and speed.
A number of laser pointers would be set up in each compartment. Each would be capable of projecting onto the wall an arrow shape with varying orientation and length.
In this way, the external flow of air (or water) could be represented on the inside of the vessel as a (very crude) field of moving vectors.
This would probably reduce any tendency to motion sickness and help keep a crew more aware of their current operating status.