Personification is a literary device that you can find in a piece of writing whenever an object, idea, abstract concept, aspect of nature, emotion or any event is given humans characteristics (such as thinking, talking, playing, throwing a ball, etc.). The provided sentence uses this type of device when giving the spheres (non-human, an object) the human attribute of being at play, as if they had the consciousness and will to perform such act as humans do.
One way teachers can honor cultural differences is by letting students from different cultures be the expert. Teaching other students about traditions, explaining the history and geography of countries and regions, and sharing cultural experiences are some ways to let these students know they are valued and welcome.