Watch these three infants and celebrate the joy of infants among infants as they share the delight of bells, jiggles, and babbles. As we watch their movements, we wonder what they wonder. Why do they shake the hanging bells while not looking at them but rather looking elsewhere? Is there a contagion from one infant’s action to another? Are their babbles messages to one another or spontaneous expressions of delight? What can we infer by the slight variations on the ways in which they pull on the hanging slinky and bells? What does it mean for an infant to change from a low perspective to a higher one by pulling up on a vertical bar?

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