Hidden Objects

Im thinking about objects that are hidden maybe out of site somehow,  I at the Kelvingrove Art Gallery and there is this tree, which I saw and thought I'd take a picture of it and when I looked closly at the photos after I rrealized at the top of the tree there is this full size chair hidden in the branchs, this just interested me this idea of objects being in situe and not screaming in your face that they are there but rather left to be discovered by someone.