Micro-structures are fascinating.
Nature’s 3.5 billion years of trial and error have resulted in many uses of them, in this case using the surface tension of water to control how it behaves.
Other structures refract light and produce color, or a specific wavelength through constructive and destructive interference.
Many times when we become aware of physical properties we can produce then we look closely and find nature has been there and done that.
The answers have been there all along, we just didn’t know how to read them. - Carl Sagan