Please send letters for the website, clearly marked FORUM, to Julia Dawson at: julia.dawson@emap.com or The Architectural Review, Greater London House, Hampstead Road, London NW1 7EJ, England. GLASS WALKWAY AT GRAND CANYON SIR: I was horrified to hear the news. They are going to build a glass walkway at one of the viewing points on the Grand Canyon. The Grand Canyon has been there for millions of years without being spoilt. There are plenty of viewing points. I can only think this is to make a few more dollars. Yours etc Jean R. Ford