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This optical illusion in the GIF happens due to a combination of wireframe rendering, perspective ambiguity, and symmetry. Here's what’s going on:
🔁 Illusion Breakdown:
Wireframe Transparency
The mesh is rendered in wireframe mode, which means you can see through the model. As a result, both the front-facing and back-facing parts of the head are visible at all times.
180-Degree Flip Confusion
When the head rotates past 180 degrees, our brain gets confused because it doesn’t get occlusion cues (like shadows or hidden lines) that would normally tell us which surface is in front.
Instead, both sides overlap in a symmetrical, transparent way—making it look like the face never fully turns around.
Symmetry of the Human Face
The face is nearly symmetric from front and back (in this wireframe especially), so when it rotates, the mesh looks almost the same coming or going.
This creates a reversible perception—your brain can’t easily decide if it’s rotating forward or backward, adding to the trippy effect.
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