When we look at the natural world, we find that there are virtually no straight, parallel, or right-angled "quadrilateral" shapes. However, when it comes to items that store things efficiently, such as bags and wallets, mathematical and physical regularities are extremely important.
Many of man-made objects, including cards and banknotes, are rectangular. The most efficient way to organize these and eliminate dead space is through a design based on regularity. The shape of our wallets is the mathematical answer to how humans, living in an irregular natural environment, can most efficiently carry their belongings.
Enjoy designing SOLAHANPU:
https://solahanpu.com/
