Bulging grid coloring page
A grid whose lines curve outward in the middle, so the flat page seems to swell toward you like a ball behind glass. Every optical illusion here is strongest at high contrast, so give neighbouring shapes colors far apart in tone: one very light, one very dark.
Fine lines, patterns and many small areas for colored pencils and markers.
Free for personal, home and classroom use. See the license. Printing tips: how to print coloring pages.
