BUTTERFLIES by Anea
This art uses translational (slide) tessellation symmetry. It's easy to spot this kind of tessellation because each "tile" (in this case, butterfly-shaped tile) is slid along the X or Y axis to a new position, without resorting to flipping, rotation, or resizing.
Anea has used green and blue color choices to let us know where each "tile" ends and its neighbors begin. She's also taken the unusual step of using both a white and a black border to emphasize the tiles' borders. She has used shading within each colored area to give the butterflies the proper shimmer and perhaps a bit of 3D curving effect.