optical illusions

Das Gespenst! : wie im Gespensterdrama produziert, das im Volksmund di...

Diner Dentu [trompe l'œil] - Public domain dedication image

Public domain scan of newspaper clippings, periodicals, free to use, no copyright restrictions - Picryl description.

Décoration d'une villa--peinture de Pompéi

Picryl description: Public domain image of an Italian architectural drawing, design, free to use, no copyright restrictions.

Spectres on the stage - An old picture of a man standing in front of a...

Public domain scan of artwork related to technological or industrial history, free to use, no copyright restrictions image - Picryl description