A request for proposal for a specific program may require the company to review the bids to not only examine their feasibility but also the health of the bidding company and the ability of the bidder to actually do what is proposed.
The most obvious reason for using spatial imagery in metaphors is that the language of the primary processes (e.g., dreams) is spatial imagery. This can explain everything, but is trivial: it is always true, and you cannot make meaningful distinctions with it in a text or in changing contexts.
In literature, abstract imagery is language that portrays sensations or experiences that have no physical parallel, such as ideas, concepts, or emotions. It is distinct from concrete imagery, which describes physical objects and sensations like colors, sounds, and shapes. This is different from abstract visual art, although abstract art and abstract imagery in literature share a common motivation: to express something that cannot be perceived by visual or sensory means.