John Spevacek’s favorite structure is:

Polyethylene
Single Crystals

image

Source: Philosophical Magazine Volume 2, Issue 21, 1957

Why?

XRD shows that the chains this image are oriented upright, yet he shadows of these crystals showed they are thin, much thinner than the length of the polymers that make them. The only possible conclusion: the chain are folded back and forth and are not extended like "spaghetti in a box". A revolutionary thought back in 1957 that completely changed our understanding of polymer crystallization.—John Spevacek

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