Another example was at the writing center. Not only are they carrying on conversations with each other, they are practicing writing skills and fine motor skills. While this activity looks like its more learning than play, it's play because they decided to do this, no one made them go to the writing and no one told them what to do. The activity is set out, and the children choose what to do.
The same goes with stinging the beads and play dough activities. They are working on fine motor, math, and social emotional skills just to name a few.