Reaching for...Dust?

How dare I admit this, but hopefully, I'm not the ONLY one who can see dust particles streaming through the sunbeams, as they enter the windows. 
We have a cute little window on our second floor, that can be seen from the bottom of our stairs.  Around 6:30 p.m. we are hit by the strongest, brightest, shot of sun.  If you are sitting in its path, there is no doubt, you'll switch seats.
Yesterday evening, Mills saw this "beam" of sun and the many floating particles that floated through it.  I don't care how clean your house is, unless you have a monster of an air purifier, you're going to see dust, dander, and what have you, floating around.  I would love to have one, but have you seen the price tag on those things?  I can't stand it, but I know there is basically nothing we can do.
I looked over and he was standing in his Nana's lap, reaching for the beam, saying, "ooooooohhhhhh!"  I had no idea what he was reaching for until I stood behind him and looked up.