SIZE
The size of the Prouns should be understand as how big or small they all. Of course, a in a virtual space a Proun's size only really be understood relative to other Prouns. In a physical space, they could be microscopic or the size of entire buildings. We can further divide size into two distinct categories: Body Complexity and Scale.
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Body Complexity
According to Robert's Formulae, Body Complexity is calculated by comparing a Proun's overall Body Size to its Flatness. How many limbs does it have, and how much space do those limbs take up?

A high-complexity Proun from Species No.3 (Species No.3 complexity ranges from 419 to 512)

A low-complexity Proun from Species No.2 (Species No.2 complexity ranges from 8 to 14.7)
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Scale
Scale refers to how much space a Proun occupies, or appears to occupy, in our physical world. In scaling the Prouns, we should keep in mind the physical limitations of the Centre Pompidou, the Forum, and how many Prouns we expect to be visible at once.
Scale has yet to be determined. Of course, the bigger they are the less can fit at once and the more ground they can cover in a single jump.
