A thaumatrope for basic
two-frame animations
Offer a less often-seen interaction and give a memorable illustration of how two things go together - or separate something from a crowd! This works especially well when the result is something many would find surprising.
Show the flowers or fruit of an unusual plant
Vividly demonstrate a life cycle link, a plant-feeding or predator-prey relationship
Pick Wally out of a scene! Or an equivalent…such as an important cell, engine part or decorative detail