One person's waste is another person's treasure and for artist Nicola Ellis, that saying could not be more accurate.
Most of the infrastructure will have been built just weeks before the event, but failure is not an option for sports events in particular. It's obviously unacceptable, says Wilson, "If you're five seconds late for the 100 metres."
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公式： f(x)=x⋅Φ(x)≈0.5x(1+tanh[2/π(x+0.044715x3)])