Unfortunately you can't see light passing a point, it needs to be reflected to be seen (seeing it is actually a process of turning the light hitting a cell in your eye into an electrical signal)- and to have something to do that reflecting requires some form of matter.
And since light is energy (which is equivalent to matter anyway) as soon as you fire it off, it is a THING occupying, and travelling (perhaps even creating) space.
Yes, space is meaningless without a point of reference (or matter) in it, but further; perhaps matter is meaningless without space. The point I'm trying to make is that the two previously separate ideas we have about space-time and the things that inhabit it are perhaps more intertwined than we think - and are perhaps the manifestations of a deeper something.
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