Hole in bottom of a shoe
Grape on a spoon
Looking into a tunnel
One-eyed ghost
Inside the letter "C"
Key hole
Antique car horn
Flower vase
Jaws
Zipper
Circular saw blade
Part of a sunburst
Number four
Road intersection
Chair
Capital "J"
Ball falling off table
Owl winking
Pac-Man
Sun and pyramid
From The Look Again, and Again, and Again, and Again Book by Beau Gardner, 1984. Source here.