Why can't you travel south from the south pole?

Once you've reached the south pole, you can only move away from the pole. And since you are moving away from the south pole you can't be traveling south.

Aha! But you CAN travel south from the south pole. It's just that you will need a space ship to do it. We do not have two poles, called 'north' and 'south'. The pole is one line that continues indefinitely in a straight line, up from both 'poles' on the globe, as we call them for convenience. Hop in your ship, set your course along the pole, and fly south for ever.