You see maps all the time with all 7 continents laid out in a rectangle, and you know that the map can't really be quite right, since we live on a sphere...
How to get from a sphere to a flat map is an old question. Mostly we see a solution called the Mercatur projection.
You might have seen the West Wing Episode (season 2, epsiode 16) where some people lobbying the President to champion showing our planet in school maps using the Gall Peters projection.
But did you know people have come up with dozens of ways to "see" our earth projected onto a map?
Here's an amazing website showing the most famous projections in sequence.
For more on projections see XKCD cartoon about "What Your Favorite Map Projection Says About You."