Space

A girl came into our tutorial class half an hour late. She was exasperated and spoke loudly.

"How do i get here?!? It's like NUS has become a labyrinth!"

"Aren't you a year 2 student?" The tutor said.

"3!"

But i don't blame her.

Our class was on the 2nd floor of block 5.

Walking from the 1st floor of block 4 gets you to the 4th floor of block 5.

Walking down the stairs from there will get you to the 3rd floor, the sign on the wall tells you what is located on floor 1 to 6, but the staircase does not go any lower than the 3rd floor.

Go figure.