"A mural is any piece of artwork painted or applied directly on a wall, ceiling or other permanent substrate, usually a vertical one, that is to say a wall. Historically, they are especially associated with the fresco technique, where the pigments are applied to a thin layer of wet plaster, into which they sink.
Some wall paintings are painted on large canvases, which are then attached to the wall (e.g., with marouflage). This technique has been in common use in Great Britain since the late 19th century." - (en.wikipedia.org 26.01.2022)
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