Twist, Bristol

This 20m, power-autonomous slate tower by artists Heather Ackroyd & Dan Harvey at Cabot Circus in Bristol uses a wind turbine and a photovoltaic array to generate power for its own lighting scheme. It uses hyperboloid geometry to create curved forms from straight lines. An internal steel frame supports layers of slate cladding.

The Bristol Alliance

Heather Ackroyd and Dan Harvey


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