When artists make art, they shouldn't question whether it is permissible to do one thing or another.

Sol LeWitt: Artist's Books. While their forms are curvilinear playful and seem almost random they are also drawn according to an exacting set of guidelines. His frequent use of open modular structures originates from the cube a form that influenced the artist’s thinking from the time that he first became an artist.

Solomon "Sol" LeWitt (September 9 1928 – April 8 2007) was an American artist linked to various movements including Conceptual art and Minimalism. He has been the subject of hundreds of solo exhibitions in museums and galleries around the world since 1965.