Sure, I’ve seen a sunbeam catch the edge of a leaf and make the whole room feel… different. It’s like a tiny cue, and unless you’re already staring at that exact angle, you’ll miss it. I’ve set up a routine to sit by that window, wait for the light to hit the same spot. If it does, you can say you’re watching the mood shift. If it doesn’t, well, you’ll have to keep looking.