Some of the changes recommended by experts involve mimicking aspects of the natural world that humans find comforting. Ways to build a happier home may include, for example, the use of natural surfaces (like wood), relatively high ceilings, and windows with views of nature. Two preferences theorized to be based on evolution are the desire for refuge (a sense of being sheltered from threats) and the desire for prospect (a sense of being able to monitor the environment). Spaces that deny people prospect and refuge—like offices that leave workers exposed and with restricted views of their own—are more likely to make us miserable.