trompe l'oeil: a painting rendered in such great detail as to deceive the viewer concerning its reality
physical entity: an entity that has physical existence
polypodiaceae: ferns: a large family that in some classification systems has been subdivided into several families (including Aspleniaceae and Blechnaceae and Davalliaceae and Dennstaedtiaceae and Dryopteridaceae and Oleandraceae and Pteridaceae)