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= All Your Yesterdays = All Your Yesterdays (2013) is a free art anthology published by Irregular Books in September 2013. The book was created by the authors of All Yesterdays: Unique and Speculative Views of Dinosaurs and Other Prehistoric Animals (2012) , by paleoartists C.M.Kosemen, Darren Naish and John Conway. Following in the footsteps of All Yesterdays, the book offers an glimpse into the creation of speculative paleoart, this time by young artists following an online contest announced by the authors of the first book .

Contents
All Your Yesterdays is a compilation of speculative, but scientifically plausible illustrations depicting prehistoric fauna by young artists from all over the world. The book, much like its predecessor, examines theories and findings often overlooked by mainstream artists, such as the evidence of bird-like feathers on Theropod dinosaurs, Trilobites using camouflage and grouping together to confuse predators and the possibility of common modern illnesses, such as cancer and bacterial infenctions, affecting dinosaurs.

Introduction
The volume has a short introduction written by C. M. Kosemen, wherein he explains the reasons that led to the creation of All Yesterdays. He is worried about artists "typecasting" certain species in certain roles, creating the illusion that herbivorous animals were helpless, while the predatory dinosaurs were killing machines. Kosemen also mentions the common practice of "shrinkwrapping" extinct animals by disregarding the muscles, fat and integument these animals would have had when reconstructing their shape. He mentions that thanks to the exposure the Internet had granted their publication he and his fellow authors seem to have contributed to a "second Dinosaur Renaissance" which came about thanks to the spread of digital publishing forums making new discoveries easily accessible to everyone. As a result of All Yesterdays ' popularity, a number of artists published their similarly themed art online, which led to the authors' decision of holding a contest. The quality and quantity of the art submitted during this contest and the global scale of participation were the main forces behind the birth of All Your Yesterdays.

On All Your Yesterdays
Darren Naish wrote a second, short introduction for All Your Yesterdays, detailing his initial scepticism about the contest and the quality of work that would be submitted and his later astonishment over the actual works of art entered in the contest. According to him, the contest "attracted professionals and semi-professionals as well as interested amateurs". The author brings up the question whether bringing more speculation to paleoart is a wise decision and arrives at the conclusion that hard facts are an absolute requirement in their line of work, but paleoartists should be flexible when it comes to depicting behaviour and soft tissues; fields where less information is readily available. His short essay contains illustrations by Charles R. Knight, as an example that while his paintings had been deemed unscientific following the Dinosaur renaissance, these portrayals still have artistic and historical value.

All Your Yesterdays
The art of All Your Yesterdays is accompanied by short paragraphs explaining scientific data and speculative reasoning behind the subject matter. The subjects explored by the artists range from social behaviour, for example playing Compsognathi or Troodon parental care to the existence of diseases and mutations in prehistoric animals, such as a Velociraptor suffering from mouth cancer, a melanistic Smilodon populator or a two-headed Zupaysaurus. Other illustrations are speculative looks at the soft tissues and keratinous structures of prehistorc creatures, for example Ambulocetus reimagined as a giant sea otter, a bioluminescent Nyctosaurus and a streamlined, whale-like depiction of a Mosasasurus.

Paleontological Findings
The validity of two speculative art pieces were confirmed after the 2013 publishing of All Your Yesterdays. Andrea Gassler's A Scansoriopterygid with Wings was based on a 2008 theory by Italian palaeontologist Andrea Cau. Nature published a Chinese discovery of Yi Qi, a Scansoriopterygid possessing membranous wings in April 29, 2015. The artist speculated that the long fingers of Scansoriopterygidae were used to support a bat-like wing membrane. Another piece of speculative art about a filter-feeding member of the Anomalocarididae family by John Meszaros titled "Ceticarid" was confirmed to be a close approximation an extinct member of the same family found in Morocco in June 2015. The group this filter-feeding Arthropod belongs to was named Cetiocariadae after the drawing.

Gallery
= Források =

Category:2013 books Category:Paleoart