2G: Planck units measured with the black-hole coupling 2G, so the Triangle's apex sits at exactly 1 Planck mass × 1 Planck length. Textbook (CODATA) values are √2 away.
Design by Alex Van de Sande, based on
a paper by Charles Lineweaver and Vihan Patel
Every element sits here by its real size and mass. The lines join neighbours in the familiar table, solid along the periods and dashed down the groups, so you can watch the grid bend.
Along a period atoms get heavier but smaller: each new proton pulls the same electron shell in tighter. Then a new shell opens and the next alkali metal balloons out, so every period is a sawtooth.
The long spike is palladium. Its neighbours keep an electron in the outer 5s shell; palladium tucks all of them into the inner 4d, and comes out barely bigger than hydrogen, under half their size.
The lanthanides huddle in a clump. They fill the buried 4f shell, which hardly shows from outside, and shrink a little at each step. At the bottom, relativity starts to bite: francium comes out a touch smaller than caesium above it.