Things are not always what they seem.
Prepositions are words that are used to indicate a location, time, or direction. In this case, the word "under" would be the preposition since it shows the location of where the children sat.
Everything that is said has mostly to deal with a tree, so that is why they used a tree for the image.
On an individual level, othering plays a role in the formation of prejudices against people and groups. On a larger scale, it can also play a role in the dehumanization of entire groups of people which can then be exploited to drive changes in institutions, governments, and societies.
(hoped this helped)
