concentric lines. spiral background. volute hypnosis circular

centrifuge circle circular concentric curling curve curvy cycle cyclic design effect fantasy geometric graphic helix hypno hypnosis hypnotherapy hypnotic hypnotise hypnotism hypnotize idea illusion illustration infinity line movement optical psychedelic radial rotate rotating rotation scroll shape spinning spiral striped swirl swirling symbol trance twirl twist vector volute vortex whirl whirlpool