William Gibson says:
"Remix is the very nature of digital."
And with remix comes both collaboration and new ideas, as Sarah points out.
The digital world of the internet and connected devices, I guess, makes it easier for people to access someone else's thoughts or ideas, and make new meaning out of them. It enables a chain reaction of thought.
Or as Faris mentions "What are metaphors but remixed ideas."
By the way this post is a classic example of a remixed post which hasn't added much to the original thought.