This classic Brusspup clip showcases the famous hollow-face optical illusion using printed T-Rex papercrafts. It starts with a single green dinosaur sitting on a white desk, and as the camera moves up, down, and side to side, the T-Rex seems to turn its head and follow the camera everywhere. At 00:30, the setup expands to eight T-Rexes in red, purple, and green arranged on a table, all appearing to swivel their heads in unison to track the lens. The visual is accompanied by a relaxed, atmospheric instrumental synth track with smooth ambient chords and a soft beat.
The real highlight happens around 01:08, when the illusion is scaled up to a massive, living-room-sized T-Rex cutout. The camera pans around as before, with the giant head smoothly following, until around 01:34 when the camera walks around to the side and back. Seeing the deeply inverted, concave cardboard structure completely shatters the illusion, revealing how the inverted shape tricks the eyes. The moment the camera steps back around to the front at 01:55, the mind immediately snaps back to perceiving a normal, tracking 3D head.
It is a classic viral video for a reason and a fantastic demonstration of depth perception. What makes it so fascinating is that even after seeing the hollow back side and knowing exactly how the fold works, your brain simply refuses to see the concave shape from the front and forces the 3D illusion on you anyway.