Glossary of Art and Painting Terms: O

An easy-to-understand explanation of what oil paint is, and its properties, in a fine art context.

Find out who the artists we call the Old Masters were and when they lived from the About.com Art Glossary.

An easy-to-understand explanation of what is meant by the term Op Art, or Optical Art, from the About.com Art Glossary.

An easy-to-understand explanation of what is meant by a paint color being opaque, from the About.com art glossary.

An easy-to-understand explanation of what is meant by an optical mix in painting, from the About.com Art Glossary.

An explanation of what osmosis is, and how it is this that makes moisture-retaining palettes work.

An easy-to-understand explanation of what outsider art is and who qualifies as an outsider artist, from the About.com Art Glossary.