How do blind architects rethink buildings?

Blind architects have a real feel for the site lines — Fascinating LA Times article on how Christopher Downey, an architect who lost his sight after a brain tumour, continues to work. It’s a shame there’s not more detail of his process or designs, I’d love to see what he’s doing with the Polytrauma & Blind Rehabilitation Center in Palo Alto (via Boing Boing).