...that's what your laptop becomes when you leave it unattended.
During Reading Days & Exams, do not leave your belongings unattended in the library, even if you're gone "just for a second," or "have take this very important call," or grab a snack etc. etc. A moment is all that a thief needs. The librarians at the reference desk move around the third floor and cannot keep an eye on your stuff.
Carry on then.