Fig. 1.

Example stimuli. a Example Sheinbug stimulus, every Sheinbug has similar components and configuration. The top row is two different Sheinbugs, the bottom row are the same examples rotated. b Example Ziggerin stimulus, every Ziggerin has a similar vertical rod structure with two geometric protrusions. The top row is two different Ziggerins, the bottom row are the same examples rotated. c Example Spaceship mounted onto a wooden base. The top row are two different spaceships, the bottom row are the same spaceships rotated