(Left panel) Experiment 1: box-and-whisker plot of relative time spent on planar views and on three-quarter views across all object manipulation time in four equal sized age groups: 1 year olds, 1½ year olds, 2 year olds, 2½ year olds. (Right panel) Experiment 2: box-and-whisker plot of relative time spent on planar views and on three-quarter views across all object manipulation time for adult participants. The proportion of time on planar views, expected by random viewing, is given by the solid reference line, and the equivalent proportion on three-quarter views, is given by the dashed reference line.