 This observation led to a movement characterized by the idea that prehistoric animals could be shown in artworks engaging in a greater range of behaviors, habitats, styles, compositions, and interpretations of life appearance than had been imagined in paleoart up to that point, but without violating the principles of anatomical and scientific rigor that had been established by the paleoart revolution that came before.Additionally, the traditional heuristics used in paleoart up to this point were shown to produce illustrations of modern animals that failed to depict these accurately.These ideas were formalized in a 2012 book by paleoartists John Conway and Memo Kosemen, along with paleontologist Darren Naish, called "All Yesterdays