3D logo with initials I

The idea is to create a solid that seen exactly from one side looks like a Z, and seen from the front side looks like an A. It is a gift for my dad, these are his initials.

Later I succeeded to mix in a third letter, in a different model.

It is inspired in the cover of the famous GEB book: https://en.wikipedia.org/wiki/G%C3%B6del,_Escher,_Bach