Ch. 2

more alert, energetic, and positive by bright highlights and crisp shadows

Quality of light

the plane on which visual tasks are usually done; a horizontal plane 2'-6" above the floor, unless other indicated.

environments that are complex, crowded, asymmetrical, novel, unfamiliar, surprising, or random.

environments that are simple, uncrowded, symmetrical, conventional, familiar, unsurprising, or organized

a lighting condition characterized by a large proportion of diffuse light and a small amount of focused light.

a large proportion of focused light (on an object or the foreground) and a small amount of diffuse light (the background)

• ambient, focal glow, and sparkle.
• Ratio of ambient light to focal glow establishes the degree or brightness contrast in a space; sparkle adds the highlights that contribute to feelings of well-being.

having the reflecting properties of a mirror; a smooth reflecting surface.

impressions of a rooms largeness or smallness is affected by the intensity and uniformity of the lighting at the room perimeter

lighting schemes rated high in facial clarity are considered more public, and those in low clarity are considered more private

Implies intermingling and bringing people together. the potential for visual contact imporoves as the intensity of general illuminance is increased.

suggests separating people and keeping them apart. Shadow and silhouette reinforce feelings of detachment and privacy because these lighting techniques inhibit the ability to perceive precise facial detail; even nearby individuals become more anonymous.

nonuniform brightness produced by a downward concentrating lighting system rates more favorably than the uniform brightness produced by a diffuse system

lighting vertical surfaces reinforce feelings of spaciousnes, clarity, and pleasantness

even a string of bright, sunny days will become boring through overfamiliarity. variation increases stimulation and impressions of pleasantness.