What's a (natural) number? What does it look like?
Not a number's symbol, like 3, III, ٣ or Γ. Not an object with a numeric property ("squares have 4 sides").
Number7 is a creative interpretation of the number 7, based on von Neumann's construction of natural numbers. Each circle represents a set. Empty circles are empty sets. Think of the artwork as 7's blueprint: An elegant, simple and easy to understand construction with fractal properties.
Number9, Open Edition's page has more details on the concept and ideas behind the collection.
Distributed under CC0. Let's spread an idea worth spreading beyond mathematicians.