LIGHTNING and OCEAN
This tessellation shows translational (slide) symmetry.
The "tile" (tile = repeating shape) is very neatly, precisely reproduced and fits with all the other tiles perfectly, without gaps or overlaps. This works best as an abstract tessellation, like the Alhambra geometric tessellations. However, when we labels parts sky and water, this ceases to be a tessellation because air and water are gaps.