There are also ways to trick the eye by covering every surface with a single color—or just the opposite, by treating one or more walls differently.
To make a skinny space, such as a converted sunporch, appear squarer, Schlotter suggests painting one side a different color from the other; cool colors, especially, can make opposing walls feel as if they were moving apart. For tight passageways, she offers another trick: "Paint the wall at the end of a hall an entirely different color. It creates a destination and erases the tunnel effect."
For a small entryway, consider a single saturated shade, like Behr
's Waterscape, "which makes a transition area more interesting because it's bold and unexpected," says Woelfel.