> (do you ever actually see light itself?)

You see color when light bounces off something towards you. Rays (like sun
through clouds) can create this effect when there are some sort of particles
in the air for them to bounce off of. Scattering media simulates this.
Beware, it can be frustrating; you may want to start with simple emitting
media first (which will not interact with light).

 - Slime
[ http://www.slimeland.com/ ]

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