Optical illusions
Spiral Illusion Sand Table Pattern
Concentric circles disguised as a spiral by tilted segment shading.
This figure contains no spiral at all — every ring is closed — yet the eye insists otherwise. Trace one ring in the finished sand and win the argument.
Why it fits Drift: This figure contains no spiral at all — every ring is closed — yet the eye insists otherwise. Trace one ring in the finished sand and win the argument.
Keywords: spiral illusion sand art, fraser spiral pattern, concentric illusion drawing