This optical illusion is telling you 
to drink more Coke at the beach.

This Coke can contains a summertime figure/ground optical illusion where you can see either a bottle of Coke or a pair of flip-flop sandals. This perceptual trick is also used in the well-known Rubin vase illusion, where two faces face each other and their profiles create a vase.

This isn’t the first time Coca-Cola has used this type of illusion to create their pop/soda/soft drink. Here’s another version of the same type of  illusion, used to advertise Coke Zero (from Mighty Optical Illusions.)

Coke Zero Optical Illusion

See more Rubin vase illusions here at Deceptology>>

– Figure-Ground Perception, Wikipedia>>
– Coke Zero Optical Illusion, Mighty Optical Illusions>>