Charlie's Horses And Their Golden Apples Rolling Out

 My morning began rather abruptly with a visit from the Charliehorses.  If this does not happen to you, well, that's very good.  Got that all settled down with some obnoxious drink that has potassium in it.  Got the coffee going.  Himself turned on the light out here. I sat down.  Out of my mouth came:

                                     LIGHT!  THE FIFTH DIMENSION!

Now, I have learned over time, to pay some attention to this sort of verbal surprise.  What could it possibly mean?  Isn't light included under the heading of the visual dimension?

That's for wiser heads to determine.  My dials are just a little loose.