halftone stippled dotted geometric figure dotwork style different stippling illusion 3d s infinity torus knot loop

circle concept cube dot dotted dotwork endless figure form fullpoint fullstop geometric geometrical geometry gradient grainy granular granules granulose halftone illusion illustration infinite infinitude infinity klein knot loop mark noise optical pen period perpetuity point pointillism polyhedron shape solid sphere square stereometry stipple stippled stippling style torus unreal vector