While watching all the great Star Wars clips on YouTube from Anaheim this year I cannot stop to be amazed by BB-8.
So simple, yet elegant, advanced and so new compared to what we have seen before, but most important: Real!!!
Here is a video where BB-8 is presented as a real prop:
Till now there are speculations about how BB-8 works. You may want to start here:
Notice “READ MORE” as well as the links which the article refers to. rEEEally XKCD 🙂