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Drawing mesmerizing 3D tunnel illusion with black ink pattern creating deep vortex effect

This video shows the process of drawing a geometric optical illusion using repeating black shapes arranged in a circular ...
insider.si.edu

Patterns for Circular Shapes

These sheets contain drawings and pattern pieces attached to sheets that relate to circular shapes. The patterns are cut from paper and metal. The models include: 1. oblique circular cone, OCCO-PL - ...