Someone else got a hold of the blue tape and the Sharpie
You might not be able to see exactly what happened here...
...so I'll tell you: Daniel wanted to do a job so that he could play video games. I asked him to tidy up the two school shelves we have in our family room. We keep almost all of the school books we use daily there and some extra stuff too. A few minutes after he got started, he came wandering by saying, "Mommy, where is the blue tape?"
You can't see his labels on the tape but each set of books has it's own place now!!