3. To infuse a space with energy. "Nobody wants to see a picture of an empty restaurant, bar or lounge," says photographer Michael Kelley. Kelley welcomes the addition of warm bodies and smiling faces to avoid a "postapocalyptic feeling," as he calls it, in spaces that are meant to have people in them. This rooftop patio in Mexico is breathtaking with or without people. But imagine what the photo would look like if the guests weren't congregated in the different conversation areas. It would be strange to see the space without people, especially since the patio is called the "margarita lounge." The cluster of people in the space is absolutely fitting.