20X11

We got a letter saying:

We have the technology, the knowledge and the resources to realize any construction, the only restriction is our own creativity - we have all the answers but:
What is the question?

Friday 1 April we are one of 20 architects invited to:
1 - formulate a question
2 - propose an answer
3 - show the consequences

..all in 11 minutes.. 20X11!