Ask HN: What is the psychology behind why we like containers or boxes?

New top story on Hacker News: Ask HN: What is the psychology behind why we like containers or boxes? The more I’m looking at business success the more I’m realising that some successful businesses are based on their ability to contain a raft of solutions to a single product or solution. e.g. I buy an iPhone because I know everything it can do without needing to make a chain of decisions about CPU, memory, display quality etc... I’m after some books to help understand: Why is this? What about the human psychology yearns for things being wrapped up neatly? Where does this come from in nature? Conversely, why do some of us like to tinker and not be bound to containers? Are there natural examples of this?