Funny Falling Bookends

I love books but sometimes I find it hard to organize them especially with my kids' text books. In their cabinet where I told them to put their current school books I always see falling books even if I keep telling them to make sure they use their book ends. Well I'm giving them the responsibility of keeping their books organized as they're big girls now. I sometimes think that maybe I need a little trick on the kind of bookends to give them for their use. So what do you think with this book ends design idea? 

Source: boxibrain.com via Race on Pinterest