Blank Canvas (plural blank canvases or blank canvasses) (idiomatic, figuratively) I.e a canvas that is blank. Something with no content, upon which one can easily impose one's point of view. It’s blank. The canvas. A person or thing that has nothing of substance or permanence within or imprinted upon him, her, or it, such that it can be easily filled with entirely new things. Refers to a painter's canvas that has yet to be painted on.