Context - Commonsense inverse relationship.

 Consider this sentence - There is a glass on the table.

Commonsense tells us to believe that the table surface is bigger than the base of the glass. (And a host of other things like say, the whole of the glass base is within the table surface). 

If the contextual information is supplied, there is no uncertainty and thereby necessity for commonsense, in principle. 

Context shapes / moulds / trims commonsense. The more contextual information you supply, the lesser commonsense you have to plug in / assume to understand the meaning of the sentence. But no contextual information is sufficient, for all practical purposes. There will always be some commonsense that will be left out, to be assumed, which is NOT supplied in the context.

(Probably that's the 'gap' when we say - a picture says what a 1000 words cannot describe).