How would you represent the light on an object, for example, on a cone?
INFLUENCE OF LIGHT IN SPATIAL PERCEPTION Light is a natural or artificial physical phenomenon that allows us to see and distinguish objects that surround us. When light shines on an object, it creates areas of light and shadow. If the light changes, the perception of the object changes as well.
ARTIFICIAL LIGHT How can we produce artificial light?
ARTIFICIAL LIGHT Produced by humans The sources have changed throughout history. ▫Fire (bonfire, torch, candlelight, lanterns) ▫Electricity (fluorescent lights, lamps, electric lanterns, flashlight) ▫LEDs
THE DIFFERENCE The biggest difference between the two types of light is that they produce distinct types of shadows. ▫Natural light produces parallel rays ▫Artificial light produces conic rays This is the reason why the shadows are different. Can you think of other differences?
FLUORESCENT Artificial light BAJO CONSUMO LIGHT BULB
Chiaroscuro Value describes volume and depth of space In Europe artists of the Renaissance were concerned with showing depth and volume in opposition to the artists of the Middle or “Dark Ages.” Men of the Renaissance considered their time period to be the Age of Reason and rebirth of artistic and mathematical achievements. Renaissance artists manufactured the term “Chiaroscuro” to describe how light and dark can imply depth and volume.
The word Chiaroscuro is a combination of two Italian words that mean light and dark. (chiaro (clear, light) + oscuro (obscure, dark) Atmospheric or Ariel perspective was one of the artistic strategies used in the study of Chiaroscuro during the Renaissance. (Atmospheric or Ariel perspective is covered in depth in the section “Objective Color Harmony”.)
Value Contrast Value contrast can be encountered in both colorful and non-colorful art renderings. All neutral tones (white, black, all gray tones) are called achromatic, meaning having no color. All tones that have some color are call chromatic. You must consider the relationship of value to other art elements, like color, line texture and shape. All these elements must exhibit some value contrast in order to remain visible.
Light and Shadow When a mass is exposed to light, a solid object will receive more light from one side than another when that side is closer to the light source. A spherical surface demonstrates this as an even flow tone from light to dark. An angular surface shows sudden contrast of light and dark.
Light Sources and Shadows A light projected onto an object or figure creates lights, darks, and cast shadows. Your source of light may be the sun, the moon, a light through a window or an artificial light. When several light sources are present the light and dark tones vary and are less predictable.
Two Kinds of Shadows Cast Shadow: when an object blocks a light source it casts a shadow. A cast shadow is not a solid shape but varies in tone and value. Form Shadow: A form shadow is the less defined dark side on an object not facing the light source. This shadow has softer less defined edges than a cast shadow.
THE LIGHT SIDE IN TWO PARTS Highlight: The lightest spot or streak is where the light strikes the subject in exactly the middle of the light side between the shadow edge and the edge of the object. A highlight can be shiny and crisp on a glass or metallic surface, or fuzzy and muted on a dull or textured surface. Light middle tones: To avoid confusion, “always” keep the values on the light side lighter than the values on the dark side.
Notan Notan is a Japanese word meaning dark-light. The principle of Notan is the interaction between positive (light) and negative (dark) space. This interaction is confirmed by the ancient Chinese symbol of Yin and Yang.