Shapes in figure a seem to be curved.

Shared Limbs

Six people, one face.

Skull and Women

skull illusion

Sky, moon and ice skating.

Soldier is in danger.

Someone is about to go crazy!

Something is wathing you!

Something wrong with the ashtray?

Spiral

Square is distorted, don't you think?

Square is perfect; the sides are not bent.

Squares and circle. (The image is Copyright A. Kitoaka)

Squares appear to be distorted, don't they? (The image is Copyright A. Kitaoka)

Squares appear to be distorted, don't they? (The image is Copyright A. Kitaoka)

Squares are all distorted, aren't they? (The image is Copyright A. Kitaoka)

Squares have a domelike structure. (The image is Copyright A. Kitaoka)

Squares in the middle appears to be deformed. (The image is Copyright A. Kitaoka)

Squares in the middle look distorted. (The image is Copyright A. Kitaoka)