openness

(noun) without obstructions to passage or view. Example: "The openness of the prairies."

(noun) characterized by an attitude of ready accessibility (especially about one's actions or purposes); without concealment; not secretive. Synonyms: nakedness.

(noun) willingness or readiness to receive (especially impressions or ideas). Synonyms: receptiveness, receptivity. Examples: "He was testing the government's receptiveness to reform." "This receptiveness is the key feature in oestral behavior, enabling natural mating to occur." "Their receptivity to the proposal."