Alternative periodic tables: https://en.wikipedia.org/wiki/Alternative_periodic_tables

Particularly liked Benfey's, shown below.

The periodic table is, of course, not arbitrary: it is really a reflection of underlying principles. I've been learning about the most recently discovered element, oganesson (Z=118)

In the periodic table it shows up as a noble gas. Except... well, it's neither a gas (it's expected to be a semiconducting solid) nor noble (it's expected to be reactive).

So it breaks a lot of what we think of as the rules surrounding stability of the outermost electron shell. And makes me wonder if oganesson needs a different location in the periodic table, or the periodic table may need an overhaul.

New principles -> new structure to our maps

Related, and interesting, this New Yorker book review discussing the history of the periodic table: https://www.newyorker.com/science/elements/the-histories-hidden-in-the-periodic-table

Also fascinating, this discussion of all the elements yet to be discovered, in the extended periodic table: https://en.wikipedia.org/wiki/Extended_periodic_table

The table of contents alone is remarkable:

A magical mystery tour of wonderful materials: https://twitter.com/gravity_levity/status/1339256122902007811