What is Innovation?

The question seems clear, the answer is not.

Is Innovation a extrapolation of what we already know? Something that is better, higher, lower, reduced or enriched?

Is Innovation something I can learn?

Who understands that an Innovation is an Innovation?

When everybody understands the Innovation, can you still call it an Innovation?

If only the Innovator understands his / her Innovation, what then?

What is the difference between Innovation, Invention, Creation?