illusion, pareidolia, equilateral triangle, curvature, geometrical, zoetrope, isosceles triangle, oblique angle, curved, inkblot, parallax, binocular vision, apparition, zodiacal light, iridescence, camera obscura, artificial, armillary sphere, concave, fractals, earthshine, illusionary, tetrahedron, epsilon aurigae, relativity theory, incongruence, hyperbolic geometry, vortices, silhouette, elongated, imaginary, ellipse, tinkertoy, einsteinian, unidentified flying object, cubistic, sfumato, contrail, polyhedrons, mirrorlike, foreshortening, celestial mechanics, doppler effect, antigravity, mirage, symmetry, oddity, sundog, coriolis effect, hologram, geometric, spherical, fallacy, parabola, wavelike, updraft, refracting, mosiac, ingenious, stereopsis, striations, cherenkov radiation, asymmetrical, iridescent, sculptural, ovular, precognition, starlike, tininess, undulating, horizontality, orb, eggbeater, spirograph, elliptical, translucent, trapezoids, annular eclipse, infinity, convex, bejan, auxetic, parallelogram, wavy, aberration, prolate, unexplainable, gravitation, escher, sine curve, convex lens, rectangular, holograph, kirlian photography, artifical, apatosaurus, dimensional, pendulums, undulation, gnomon, phantasm, inverted

apparent motion, apparent movement, mirage, motion, movement

optical phenomenon