The Pulfrich effect, a fascinating optical illusion, transforms 2D motion into perceived 3D depth when viewed with a darkened filter over one eye. Several renowned outdoor sculptures have been specifically designed to leverage this phenomenon, creating immersive visual experiences.

One of the most iconic examples is "The Pulfrich Pendulum" by artist Michael Snow, installed in Toronto. This kinetic sculpture uses swinging pendulums and timed lighting to produce striking depth effects when observed through Pulfrich glasses. Another notable work is "Depth Charge" by Bruce Shapiro, a large-scale installation featuring moving patterns that spring to life in three dimensions under the Pulfrich effect.

In Germany, the "Pulfrich Cube" by artist Alfons Schilling became famous for its ability to create dramatic stereoscopic illusions when viewed correctly. These sculptures demonstrate how art and science can merge to create breathtaking perceptual experiences.

To fully appreciate these works, visitors typically use special Pulfrich glasses with one darkened lens. The effect works best with lateral movement, making outdoor installations particularly effective as viewers can walk around them. These sculptures represent a unique intersection of optical physics and public art, offering unforgettable visual encounters.

While not as common as traditional sculptures, Pulfrich-effect artworks continue to inspire new generations of artists exploring perception and dimensionality in public spaces. Their rarity makes encountering one in person a truly special experience for art and science enthusiasts alike.