Christopher Downey, an architect who became visually impaired after surgery to remove a brain tumor in 2008, is working as a consultant on the design of the Polytrauma & Blind Rehabilitation Center in Palo Alto, Calif. Downey uses an embossing printer to create 3-D diagrams for the center's director, who is also visually impaired, and has developed a room-numbering system and other features to help make the facility more accessible for people who cannot see.

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