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(mander.xyz)
A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.

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This is a science community. We use the Dawkins definition of meme.
Others are wrong. Please see the Reddit post where it shows the topmost portion. It has only three edges. It's open-topped.
As for the methyl and CH3 groups, that's where, as noted, I begin to suspect erroneous human pattern recognition, but I'd also see a universe where those were too cumbersome to incorporate as elements of a functional shelf (unlike the carbonyl group, albeit that's only one layer) and thus were ignored.
The two going straight up just to terminate are also not contributing to a functional shelf.