Captivating Title for the Blog Post

"The Icosahedron Metaphor: Visualizing the Category of Categories in Category Theory"

This title captures the essence of the blog post by highlighting the central theme of using the icosahedron metaphor to explain the abstract concept of the category of categories in category theory.

It is both informative and intriguing, inviting readers to explore the fascinating world of category theory through a relatable and visual metaphor.