"Behold her, single in the field, Yon solitary Highland Lass! Reaping and singing by herself; Stop here, or gently pass! Alone she cuts and binds the grain, And sings a melancholy strain; O listen! for the Vale profound Is overflowing with the sound." (From the poem "The solitary reaper" by William Wordsworth) https://poets.org/poem/solitary-reaper
Shadow puppets are also an expression of art, which tickle the mind in both imaginative as well as visual ways.
Adjective or not, the popular saying over here in my culture is (emphasizing secrecy) that even walls too have ears.