curvature
the cYBERbORE


bisection

 diverting convergence diagonals divergence
helmholz_irradiation

 hering impossible figure irradiation
oscillating_figure 1

 oscillating_figure 2 perception 1 perception 2
poggendorff

 schroeder size star
thiery

 top hat wundt zoellner
zoellner-wundt bonus:
2 M.C. Escher favorites		impossible objectmagic stairs



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