“Who said “north” was up?

"Upside-down" world map

A specialty map published by Oxford Cartographers. The first panel, in the lower-left, reads:

“Who said “north” was up?
The world, like a ball, has no top.
We can look at it from any point of view.
Top is a matter of habit, convention, and emphasis. The map (1st picture, top) teaches us to question our assumptions.”

Available (note: I have no knowledge or experience with this vendor; caveat emptor).