Air Visible Midsummer Night's Dream

The individual molecules, mostly N2 and O2, as also Pneuma and Breath are far beyond our visual resolution.

The molecules have size on the order of 10^-9 m, and the smallest thing we can see is more than a thousand times bigger than that.

A bunch of molecules together in a gas, you can see them by the effect they have on light coming through them.

Any time you see a vibration, you are seeing sound.

Photons have no physical size and so nothing is smaller than them.