
So you're driving around a car park trying to find the up ramp when all of a sudden formerly abstract letters appear readable.

The car park in the 92-floor Eureka Tower in Melbourne Australia (the world’s tallest residential building) has signs that convey information to drivers only at key
decision-making points.

Covering the full height of the walls the bold
primary colors are intended to help engage drivers.

The lettering was created by painting over text projected onto the walls from the driver's perspective.
Now if they could only paint "No Peeing" in the stairwells.