set of 4 concentric circle s. ripple, radiating circles.

abstract abstractionism black blend center centric centrifuge cercle circle circles circular colorless concentric effect element elements expand free geometric geometry graphic grayscale greyscale halftone hypnotic illustration lines midpoint minimal misc miscellaneous monochrome monocrome optical pattern radial radiating radiation rings ripple round royalty shape shapes silhouette uncolored vector visual vortex white