Which situation most aptly makes use of the fact that the Gestalt concepts of the figure and the ground are sometimes ambiguous and reversible?

Supermarkets often put special "today only" offers at the ends of grocery aisles.

Soldiers can use camouflage to hide themselves when in various situations.

Orchestra and band music can be difficult to listen to because it is hard to hear individual instruments.

Retailers will create the illusion of scarcity but suggesting that they only have a few of an item left to sell.