What a pushover! 7,000 concrete dominoes tumble in 30-minute 1.6 mile toppling to mark opening of historic festival
- A 2.5km lines of stone dominoes was knocked over yesterday across Norwich
- The installation marked the opening of a 250-year-old festival in Norfolk
- The art consisted of more than 7,000 dominoes and is supposed to encourage viewers to look at cities differently
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