It used to be everything had to be hardwired to the wall. Computers, phones, sandwiches - they all stayed in their place. Well, those days are behind us. Now, you can take everything everywhere. Like, for example, this stuff:
All the cavemen sat on rocks in the cave. They were so far away from each other that they could barely see each other's cave drawings. Finally, one day, Potak had enough and moved his rock across the cave to be closer to his friends. This is where portability comes from.
