If non-relativistic, time-independent multi-dimensional aspects of solutions to the Schrödinger equation are accepted seriously, atoms with 1 to 100 electrons may be legitimate building-blocks up to, say, 10⁵ electrons. Large systems with more than 10¹⁵ electrons (3 nanogram) have only tenuous links with quantum theory, and the chemist may feel like walking on a spiderweb constructed over an abyss.