The metaphor of "chimney" for deep thinking is rather antithesis for the whole notion of creative thinking because a chimney is for exhaust and deep thinking is hardly without intake of new ideas.
Yes it can be chimney for the "outbreak" of your creative ideas.
I was kidding.:D
What if I say I have big doors but no windows and a chimney!!
All grocery for cooking still comes from the doors. The kitchen is very very busy at times!!