N. John Habraken was a very smart man who thought a lot about how buildings should be made. He wanted buildings to be more like what people wanted and needed, instead of just what the architects thought looked good.
Imagine if you wanted a treehouse, but the architect built you a big boring house instead. That's not what you wanted, right? Habraken thought that buildings should be designed together with the people who are going to use them, so that they can be the right size and shape for the things that people want to do in them.
He came up with some really cool ideas, like having areas where people can easily change things around in their homes as they need, and ways to make buildings more affordable for everyone.
So, basically, Habraken was a smart man who realized that buildings should be more about what people need and want, instead of what looks fancy or expensive.