Duchamps' were ordinary manufactured objects placed in an art context. It laid the groundwork for Conceptual art in the 1970s.

jan tschichold, the son of a designer and sign painter

answeras live actors preforming in the same room as a live audience;

homophonic or a tonal

the mass and the sacrifice are similar because jesus christ is the victim and priest in both. the mass is different from the sacrifice in that jesus died for the remission of sins and cannot be  sacrificed again during the mass.