When proposing a challenging idea, most reasonable people will tell you that it’s almost certainly going to be impossible. Based on their entirely reasonable estimates, they will be correct.
Every big idea has to start somewhere, as a small idea, usually only held by one person or a small group. It’s easy to become discouraged by the natural indifference and skepticism of other people to new notions, because their natural indifference is just the wall that ideas need to be compelling enough to be able to hop over. That wall of distrust protects people from the swirling mass of terrible ideas which are always floating up from the human muck.
Once the idea has made it over that wall of indifference among a small number of people, the task becomes to enhance the credibility and fitness of that notion so that it can reach its potential. For something relatively simple, like the construction of a new building, the number of people that need to be convinced will usually be fairly small. Some government officials need to be paid off, suitable contractors need to be found, financiers need to be cajoled, a qualified tenant needs to be rustled up, and then the project is finished.
The structure that began as an idea, was translated into blueprints, and then put together in the real world has moved from the human mind into the physical world.
World-shaking ideas don’t necessarily need to be adopted by the entire planet, or even a substantial plurality of a large country, to have an enormous impact. All that’s necessary is to spread the idea to a sufficient number of the right kind of person, to buttress its credibility with pilot projects, to find the right environment for its implementation, and to adapt it to new audiences.
The idea doesn’t even necessarily need to be good or workable for it to spread. People just have to think that it’s good. It certainly helps for the idea to be good, but plenty of terrible ideas spread and survive despite being completely impractical and contrary to nature.
When people tell you that a proposal is impossible, you have to consider who is saying it. Most people are not natural leaders. They do as they are told, with some grousing here and there. The idea of taking initiative terrifies most people, because initiative involves bearing risk, and most people want to insulate themselves from risk. You have to instead find the people with an appetite for risk, for whom desire & ambition outweigh the fear of danger.
Anything notable begins by daring to think the thoughts that others are too frightened to make. Once you understand that most people will just think whatever the people to the right and left of them think, it comes to be a matter of shifting the tone of discussion until the opinions which were hazardous become the safe opinions to hold.