I work in a CAD drafting type job and work from a large L-shaped desk. I keep all of my material drawing stuff (not computer stuff) on one arm of my desk, all in front of me so I don't have to turn all the way around from my computer to grab stuff.
However every single morning when I walk in to work, my pen holder/ file holder and a few other typical office items have been moved to the very end of the L arm, and every time I move them back to the spot I like them, I come in to find them back in that other spot.
I am yet to ask him why he keeps moving my stuff because I don't want to be too confronting, but I can't think of a reason why this would keep happening? Nobody else's stuff gets moved at all, and they are all free to move and decorate their desk stuff however they please and I know I am not getting pranked because my office atmosphere is almost unnervingly serious 99% of the time. Any ideas???