Hands off Einstein’s books, sticky hands! Check out this awe-inspiring doodle that comprised Einstein’s ex libris*. The star-encompassed mountaintop dweller in no uncertain terms tells you that this book belongs to someone who isn’t you and that this someone is responsible for defining a ridiculous amount of the physical laws that our universe (and technology) rely upon. Very cool.

*An ex libris is also known as a bookplate and was pasted into books as a sign of ownership.