1995k-865 airforce amusements animals ballgames children'sfiction closeairsupport color colorperception colorvision commandotroops congresses congrès elephants emotions family fathersandsons feelings fiction formperception friendship geometry growth juvenilefiction juvenileliterature kleurwaarneming littlecritter(fictionalcharacter) littlecritter(fictitiouscharacter) miscellanea newyorktimesbestseller nyt:picture-books=2013-06-09 percepcao(psicologia) perception perceptiondelataille perceptionspatiale physiologicalpsychology pigs play psychofysica psychology psychometrics psychometrie psychométrie psychophysics psychophysique ruimtelijkewaarneming self-esteem self-reliance shape sharing size sizeandshape sizejudgment socialthemes spaceperception specialforces(militaryscience) studyandteaching swine unitedstates visiondescouleurs whales ww105g3451995