nautilus cephalopods seamless pattern. sketch scratch board imitation. black and white.

abstraction addictive animal background beach biology black board cephalopod cephalopods chamber close compartments curve cut decor deep design engraving fossil gastropod genus helix icon illustration image imitation incision isolated marine mollusca mollusk mother natural nature nautilus ocean ornament pattern pearl raster repetition scratch sea section shell silhouette sketch spiral symmetry texture water white