Hints

• No WebGL? Bet you're using Chrome.
• Looks random? Zoom out, bigger blobs.
• The more advanced ones have details hidden in the middle.
• Z orbitals look better from the equator.
• X/Y orbitals look better from the pole.

What is this?

These are the ways that something spherical and solid can wobble. Each picture is a snapshot where the colour shows which way a part is wobbling and the size of the blob indicates how strongly.

E.g., in 2p_z mode, it's mainly the centre that oscillates but the top and bottom halves move in antiphase. In 3p_z, there's a small core that moves in antiphase with the rest.

An electron is an example. It's actually simpler than something like a bell that physically moves about, because whereas the movement of some part of a bell is a vector, an electron only needs a +ve or -ve real number*. Nevertheless, the effect of an atomic nucleus is to bend the surrounding space into a bell on which electrons are the vibrations.

* Generally, they need complex numbers, but these are standing waves, so a real will do.

Thanks to Orbitron for the formulae.