Constrained comics is a form of comics that places some fundamental constraint on form beyond those inherent to the medium. By adding a constraint, the artist is attempting to produce original art within tightly defined boundaries.
A conceptually similar movement is the constrained writing movement, where writers have attempted to do things such as write novels in palindromic form or without the letter "e". Poetry is sometimes constrained into specific rhyme and meter categories such as haiku or sonnet.
Notable examples of constrained comics: