Erwin Schrödinger's model of the hydrogen atom electron is constructed with wave-functions rather than orbits. The wave functions are spherical harmonics with complex structures described by three quantum numbers. The topic is of fundamental importance in physics today.

Schrödinger's 2p orbitals are plotted above as three dimensional probability functions. Go to http://dauger.com/orbitals/ and download Atom in a box (Mac only).