Friday, May 16, 2008
Virtual Muse
Word Technologies
Advances in Scenic Technology & Broadway Spectacle
A chorus of up to fifty people performed the plays in verse with music. The stage was a half-circle in front of the orchestra––where the chorus performed––situated on a terrace at the foot of the hill. Theatres were built on a large scale to hold the many people on stage, and in the audience. Architects used mathematical calculations to create acoustics such that the actors' voices could be heard throughout the audience. A backdrop known as the skené stood behind the orchestra. The paraskenia, with projecting walls housing doorway for entrances and exits, became a common supplement to skenes in late 4th century BCE. Just behind the paraskenia was the proskenion ("in front of the scene") which was columned, and similar to the modern day proscenium. Among the advanced set pieces used in this era were:
- Periakto: rotating tower w/ 3 scenes
- Ekkylema: slip stage
- Machina: crane
- Pinake: flat
When Rome conquered the land and appropriated much of Greek culture, the spectacle of the theaters was taken to grandiose heights. The Roman Colosseum seated 50,000, and performed 300 days of festivals. Comedies were popular with the crowd, but of course the Colosseum's most famous legacy was the gladiatorial battles. The action films of their time, these had none of the restraint of Greek Theater. Bloody massacres, exotic animals, even a sea battle on a flooded stage.
Needless to say, when the Christian Church was established, the violent spectacle––and most theatre for that matter––were thoroughly quashed. Up until the Renaissance, the only activities resembling theatrical spectacle were Liturgical Dramas that reenacted the 12 stations of Christ, and pageants outside churches. But then came the Renaissance, and with it a revival of Greek and Roman traditions, along with new innovations. The construction of indoor wooden theaters was modeled on ships, and the machinist (in charge of special effects) was considered second only to the director. While Shakespeare employed relatively simple visuals, a contemporary of his by the name of Inigo Jones used his expertise in painting and architecture to create finely crafted masques, movable set pieces, and a rigging system to levitate chariots over the audience that baffles experts to this day.
From this period through the 1800's, theater continued to change and develop. Tennis court theaters entertained nobles outside. The romantic movement responded to classical traditions with yet more elaborate spectacles, including new technological innovations such as the limelight, followed by the first spotlight at the turn of the 20th century. Over the last century, the visual spectacles of theater have incorporated more and more advanced technology. Robotic lights are programed when to go on, and can be redirected automatically. Entire stages can be motorized to swivel. Video projections have been incorporated into sets. And yet, theaters have been overtaken by recorded media––film and television to be precise. Performances can be experienced cheaper and in greater variety in one's own living room, and theater productions charging $60 to hundreds a seat continue to lose business. But perhaps another great innovation is around the corner, to bring theater to the forefront of culture once again.
Chemistry of Pigments
After the nature of sound was discussed, the next logical step is the nature of light––and the primary substance in visual art that interacts with that light. Since long before the stenciled cave paintings of 35,000 years ago, artists have carefully considered the pigments they would use to render their work. Until the relatively recent innovation of synthesized pigments, artists had to use colored materials they found in nature to make paints. They had to be chemists as well as artists. Like sound, light is a wave. But unlike sound, it is not a physical wave transmitted through particles of matter, but electromagnetic radiation. The electromagnetic spectrum goes from the low energy radio waves all the way up to gamma rays packing deadly doses of energy, and extends far beyond the narrow band of visual light in both directions. At the low end of the visual spectrum is red, and passes through all the colors of the rainbow on its way up to violet. Each color of light is like a different pitch of sound, with the frequency of the wave determining the hue. As the myriad frequencies of light coming from our Sun interact with physical objects around us, certain frequencies of light are absorbed, while others are reflected. The reflected color is the only one we see. "Red" pigment does not in any sense give off red light, but rather absorbs every color of light but red.
The correspondence between color and substance are as follows (rather simplified):
• Arsenic pigments: Paris Green
• Carbon pigments: Carbon Black, Ivory Black, Vine Black, Lamp Black
• Cadmium pigments: cadmium pigments, Cadmium Green, Cadmium Red, Cadmium Yellow, Cadmium Orange
• Iron oxide pigments: Caput Mortuum, oxide red, Red Ochre, Sanguine, Venetian Red
• Prussian blue
• Chromium pigments: Chrome Green, Chrome Yellow
• Cobalt pigments: Cobalt Blue, Cerulean Blue, Cobalt Violet, Aureolin
• Lead pigments: lead white, Naples yellow, Cremnitz White, red lead
• Copper pigments: Paris Green, Verdigris, Viridian, Egyptian Blue, Han Purple
• Titanium pigments: Titanium White, Titanium Beige, Titanium yellow, Titanium Black
• Ultramarine pigments: Ultramarine, Ultramarine Green Shade, French Ultramarine
• Mercury pigments: Vermilion
• Zinc pigments: Zinc White
• Clay earth pigments (which are also iron oxides): Raw Sienna, Burnt Sienna, Raw Umber, Burnt Umber, Yellow Ochre.
• Lapis lazuli,
• Biological origins: Alizarin, Alizarin Crimson, Gamboge, Indigo, Indian Yellow, Cochineal Red, Tyrian Purple, Rose madder
• Other Organic: Pigment Red 170, Phthalo Green, Phthalo Blue, Quinacridone Magenta.
Before the Industrial Revolution, the range of colors available for art and decoration was very limited. Most of the pigments used came from minerals in the ground, or biological sources. Natural iron oxides give a range of colors and are found in many Paleolithic and Neolithic cave paintings. Two examples include Red Ochre and the hydrated Yellow Ochre. Charcoal, or carbon black, has also been used as a black pigment since prehistoric times. Pigments from unusual places such as botanical materials, animal waste, insects, and mollusks were harvested and traded over long distances. Some colors were costly or impossible to mix with the range of pigments that were available. Blue and purple came to be associated with royalty because of their rarity and expense.
The only way to achieve a deep rich blue was by using a semi-precious stone, lapis lazuli, to produce a pigment known as ultramarine, and the best sources of lapis were remote. Flemish painter Jan Van Eyck, working in the 15th century, did not ordinarily include blue in his paintings. To have one's portrait commissioned and painted with ultramarine blue was considered a great luxury. When Van Eyck used lapis, he never blended it with other colors. Instead he applied it in pure form, almost as a decorative glaze.
The Industrial and Scientific Revolutions brought a huge expansion in the range of synthetic pigments, pigments that are manufactured or refined from naturally occurring materials, available both for manufacturing and artistic expression. Because of the expense of Lapis Lazuli, much effort went into finding a less costly blue pigment.
Prussian Blue was the first modern synthetic pigment, discovered by accident in 1704. By the early 19th century, synthetic and metallic blue pigments had been added to the range of blues, including French ultramarine, a synthetic form of lapis lazuli, and the various forms of Cobalt and Cerulean Blue. In the early 20th century, organic chemistry added Phthalo Blue, a synthetic, organic pigment with overwhelming tinting power.
Physics of Sound
Thursday, May 15, 2008
Scientific Visualization
Benjamin West: Notes on “Painting in an Age of Innovation”
Benjamin West
In the late 18th century it was believed that British painters lacked the knowledge of painting techniques which had developed in Europe (Italy in particular). In 1760 there were many more painters in London than ever before, so there was much more competition in getting one's art into an exhibit. Artists thought that displaying greater technical innovations than their colleagues would get them noticed. As for the wax painting technique that West developed, there was an ancient source in Pliny that gave the method artistic credence, but it was vague enough to permit experimentation. Invention and experimentation were very much in the spirit of the Scientific Enlightenment that was going on at the time. Intellectuals had confidence in progress, and were not as strictly constrained by the past. Hence the term "age of innovation". Till now, painters had been essentially very conservative about sticking to old techniques, because of the learning curve of a craft that took many years to master. Benjamin West's work influenced British & American painters, and strove to discover “lost secrets” of Titian and other early painters.
Art Conservation
The job of an art conservator is to fix damaged art. Much like a physician, the conservator tries to keep subject “healthy”, and studies how deterioration occurs. The main factor in deterioration are substandard storage conditions, weather damage, and easily deteriorating media (such was the case in West's wax paintings) A conservator takes cross sections of a painting to study the pigment composition. Scientific analysis can determine issues of authenticity. On major issue in conservation is that religious articles are sometimes remodeled and copied.