I designed a Halloween sculpture that casts 3 different shadows. Just turn the base.
Three silhouettes cut 60° apart and merged into one block: pumpkin, skull and ghost. Each shadow only appears when the light hits exactly along its axis, and in between it twists and reforms.
Printed in PLA with zero supports, on a P2S. The base spins on a small ring so you can turn it with a fingertip. There's a second sculpture for the same base: owl, black cat and RIP tombstone.
Light setup: phone flashlight at the sculpture's height, about 1 m away, wall 20 to 40 cm behind.