[gmantg]

Eigenquestion is a question that's when answered, turns into the same question, but on a different scale.

[nerdponx]

From the article:

For a simplistic definition, the eigenquestion is the question where, if answered, it likely answers the subsequent questions as well. Great framing starts by searching for the most discriminating question of a set — the eigenquestion.

[michael-ax]

.. extending here to page-usability, content and readability.