Warning: the following may contain tedious and/or glib background and/or analysis.
Casting a negative space of knowledge. Calling itself a "plate" frames it as a work of learning, like some kind of 19th-century anthropology text. Yet it only raises questions — what are these entities? what kind of world do they inhabit? what are they protecting? who is Clarkson? — without providing answers, leaving it up to the observer to either imagine their own answers, or decide that answers to these questions are not necessary.
Plus it's fun to click on the red balls.