Stock

Some examples of stock being taken into consideration when designing for print, it's been eye opening to see pretty much anything can be applied as stock. Even the human body in Sagmeister's case. Also some examples here of flock stock, astrolux, metal, wood, coated paper and also Show-through as seen with Sagmeister's Made You Look book which uses the fact you can see through the outer cover creatively by using red and green separations.