One of my girls used to love it. She’d get very upset when I shined it at the mirror, since then she had two, going different directions.
Her mom would look at the dot, and seem to follow it to my hand, then walk away in disgust. Now, 'Lil does the same thing. 
I think Mama Cass gave her a talking to. 
Slight hijack: I’ve noticed both of them, at times, will seem to be actively learning how something works. Cass hates to step in anything wet. One day my husband had hosed out the unfinished part of the basement. It was partly dry when Cass came in to use the litter box.
She stood in the doorway, and looked at each puddle, and then at the dry places, all the way across the room to the box, then skipped away, never touching a wet spot. They communicate desires in a similar way. Neither like to eat out of my hand, when I’m offering a morsel of food, they will look at the food, look at the floor then at my face. The routine is repeated until I drop the food. I get a last look, then, chomp.