line circle pattern monochrome design symmetry font drawing diagram black sketch brand cartoon white text wheel logo abstract abstraction art backdrop background bulged bulging circles circular color colorful concentric decoration distortion effect element geometric geometry graphic hypnosis hypnotherapy hypnotic hypnotism hypnotize illusion lines optical psychedelic retro rings rotating rotation round shape spherical spiral swirl target texture twirl vector vortex wallpaper abstract abstraction art backdrop background black bulged bulging circle circles circular color colorful concentric decoration design distortion effect element geometric geometry graphic hypnosis hypnotherapy hypnotic hypnotism hypnotize illusion lines monochrome optical pattern psychedelic retro rings rotating rotation round shape spherical spiral swirl target texture twirl vector vortex wallpaper