3 ms·

But any shape can be made (almost) visually identical to another shape without changing the topology. For example a C can become an O if the gap becomes arbitra

But any shape can be made (almost) visually identical to another shape without changing the topology. For example a C can become an O if the gap becomes arbitrarily small.

krastanov 6y ago
Can an an O became a C in this example?
- andybak 6y ago
  Yes. The existing hole shrinks to the point of invisibility and a dimple in the side opens up to become the hollow of the C.