Art Glossary
A comprehensive glossary of art terms, techniques, movements, and materials. From chiaroscuro to creative coding, find clear definitions for every art concept.
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Fat Over Lean: The Oil Painting Rule for Layering to Prevent Cracking
Fat over lean is the oil painting rule that each layer should contain more oil than the one beneath. Learn the science behind why it prevents cracking and delamination.
Formalism in Art: Form Over Content From Bell to Greenberg
Formalism judges art by its visual form, not its content or context. From Clive Bell's significant form to Greenberg's medium specificity, learn how this approach shaped modern art criticism.
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Medium (Painting): The Substance That Changes How Paint Behaves
A painting medium is any substance added to paint to change its properties. From stand oil and dammar to modern alkyd gels, learn how mediums shape oil painting.
Medium Format Photography: 120 Film, Bigger Negatives, and the Balance Between Quality and Portability
Medium format photography uses 120/220 roll film for negatives larger than 35mm but smaller than large format. From Rolleiflex to Hasselblad to 2026's new cameras, learn the format.
Why an Art Glossary?
Art has always had a language problem. Walk into any gallery and you will hear terms like chiaroscuro, impasto, sfumato, and pentimento thrown around as if everyone knows what they mean. Most people do not. They nod along, afraid to ask, and miss half of what the painting is actually doing.
This glossary exists to fix that. Every entry is written in plain English with real examples: specific paintings, specific artists, specific dates. When we explain plein air, we point you to Monet working beside the Seine in 1873, not a generic definition copied from a dictionary. When we cover creative coding, we start with Casey Reas and Ben Fry at MIT in 2001, not a vague paragraph about "art and technology."
The terms here span centuries and disciplines. You will find Renaissance techniques sitting next to digital art movements, printmaking terminology next to motion graphics concepts. That mix is intentional. Art does not stay in neat historical boxes, and neither does the vocabulary we use to talk about it. A painter working today might need to understand glazing just as much as a 3D animator needs to know what kinetic typography means.
Each definition is a starting point, not a finish line. We write them to be specific enough that you can recognize the technique the next time you see it, but short enough that you can read one in under five minutes. If a term leads you to a painting you had not considered before, or sends you down a rabbit hole about a movement you had never heard of, the glossary is doing its job.
New terms are added regularly. If there is a concept you keep running into but cannot find here, that is a gap we want to fill. The best art terminology does not stay still. It grows as artists invent new ways of working, and the language has to keep up.