I laughed, sorry.

Yeah, clear contact over text books (you can use a ruler to help smooth it down as you go) and you can get patterned/character contact for covering the books you write in, like Bath says, it keeps them durable and they're less likely to tear, it waterproofs them a bit for when their water bottle leaks in their school bag, and it's easy to see which is theirs.

I remember having silver hologram contact when I was young, it was soooo cool!