The amazing regularity of the cavitations, symmetry, and the orderly honeycomb pattern resemble an anatomical structure or a living tissue organization. This is not a living tissue, however. This delicate lacework is Tafoni sandstone formation. The carvings of this rock are very small. The smallest cavity is approximately the size of a penny.
This fragile sturcture is an inspiration for me to make a lacy garment with a pattern resembling Tafoni. Hm!