The classic leo lionni tale of friendship and color blending. Little blue and little yellow are best friends one day mama blue goes out shopping and tells little blue to stay at home instead little blue goes out to find little yellow to play when they found each other little blue and little yellow hugged they hugged each other until they were green. Originally created on the spur of the moment to amuse two children restless from a long train ride little blue and little yellow is the book that began leo lionnis long impressive career as a creator of childrens books four of which have been named caldecott honor books. Little blue and little yellow in the book little blue and little yellow two little balls of colors are best friends they live right across the street from each other and love to play together with all of their friends one day little blue could not find little yellow and this made him sad