This video is a tribute to those people who, by their big dreams, have changed the world. It's meant to inspire us to continue to dream.
I was a bit saddened and taken aback by a few in the comments section of YouTube who called it rubbish. Without the dreamers of the world, where would be be today? Thank goodness for those people who look to the future and make it better. (And no, I don't think all change is for the better. I know that sometimes costly mistakes are made, but...if the alternative is stagnation, I prefer the occasional mistake).