A four-year-old watches as a monkey hand puppet approaches a vase containing a red and a blue plastic flower. The monkey sneezes. The monkey backs away, returns to sniff again, and again sneezes. An adult then removes the red flower and replaces it with a yellow one. The monkey comes up to smell the yellow and blue flowers twice and each time sneezes. The adult next replaces the blue flower with the red one. The monkey comes up to smell the red and yellow flowers and this time does not sneeze.