[eliteraspberrie]

Beautiful! So the dot pattern here is "face centered cubic," right? Would you get a better density with a "hexagonal close-packed" pattern? It may make a difference visually. I would love to see a comparison.

https://en.wikipedia.org/wiki/Close-packing_of_equal_spheres (We memorized this stuff in chemistry class and I never saw it again so I may be completely wrong.)

[rsfern]

The FCC and HCP lattices are 3D concepts, but you're on the right track. They're using a square lattice, but you could get a higher density using a hexagonal one.

What's really interesting is that they're modulating drop size to change the color intensity through white space and the coffee-ring effect!