Obituary: Crazy Kitchen co-creator John Arnold designed Ottawa museums, homes and even a bridge

When Canada wanted a standout pavilion for Expo 67, and a modern new science museum for Centennial Year, it handed a lot of the design work to a young man just reaching his thirties.It was no gamble. By the early 1960s, John Arnold had already built a reputation as a designer with artistic flair who also understood the nuts and bolts of construction