abstract appearance artificial artistic artwork backgrounds coloring colors colouring colours crater crater-like dark image imaginary imagination imaginative kernel large large kernel large nut make-believe moon-surface simulation moonscape-like nut representation Somber sombre surface activity ants ants-nest arid Australian background color colored colour coloured effort entrance firm grains grainy insects nest red reddish round rounded sandy Soil texture textures work circle circular compacted cone conical cracked cracks craters sand symmetrical symmetry art geological granular nests painted painting