Lattices are very cool, especially when applied to the creation of the lightest metal ever, courtesy Boeing. Pretty wild without question.
Boeing released a video where we see scientists exhibit its lightness by effortlessly blowing it away, and it floats to the floor like a feather. While being lightweight, its smart structure enables it to compress so it's excellent at absorbing energy. In the video we also see the Microlattice, which is claimed to be one of the strongest and lightest materials known to science, being squashed and twisted then simply bouncing back to shape.
Inspiration comes from studying the structure of bone, solid on the outside, mostly hollow on the inside as seen in this extreme closeup, courtesy wikipedia.