It’s got to be 10 feet wide, and is pretty impressive in my opinion. Apparently it’s a copy of this map from the 16th century: http://arshba.ru/material/maps/1565_Vniversale_Descrittione_Di_Tvtta_La_Terra.jpg
This was hilarious to the people in the car as I was driving the Zoo to school the other day, so #4 tried it on his class:
There are 5 fish in a pond. Three of them died. How many fish are in the pond?
Everybody is reported to have said there were 2 fish in the pond, including the teacher