We use threes in art to define structures like primary, secondary and tertiary colors on a color wheel. Sir Isaac Newton developed the first color wheel in 1666. The three Greek column classifications are Doric, Ionic, and Corinthian.
( fl 1236-54). Italian painter. He was one of the most important and influential figures in Italian painting of the first half of the 13th century. He is known to have signed four painted Crucifixes, three of which survive (Assisi, S Maria degli Angeli; Bologna, S Domenico; and Pisa, ex-S Ranierino, now Mus. N. S Matteo).
Pottery is the baked-clay wares of the entire ceramics field. For a description of the nature of the material, see clay.
Three types of firing
1. Electric Kiln
2. Gas Reduction Kiln
3. Pit Fire
Types of Pottery
It usually falls into three main classes—porous-bodied pottery, stoneware, and porcelain. Raw clay is transformed into a porous pottery when it is heated to a temperature of about 500°C. This pottery, unlike sun-dried clay, retains a permanent shape and does not disintegrate in water. Stoneware is produced by raising the temperature, and porcelain is baked at still greater heat. In this process part of the clay becomes vitrified, or glassy, and the strength of the pottery is increased.