I bet you thought, your journey was over but no!
As you turn the corner and walk to the door of the Vis building you lock eyes with him.
The all-knowing all-seeing wizard of Princeton stops you and you know what's next... I hope you completed your tasks
Wizard: Ah it seems you've finally made it to class. I hope you thoroughly enjoyed your journey around campus and all of the great places it's taken you. However, you knew at the beginning of this journey that you had a few tasks you needed to get done to ensure a smooth and productive week. It's about time to see if you really got your stuff done.
Wizard: Since you obviously went to your office hours and put the effort in to learn something new, which of the following doesn't actually exist in nature?