Silt curtain: fine, meshed material suspended in the water to prevent silt escaping from a construction site.

UNESCO: L O S S A R Y

There are some fine art pieces as well, including The Rise in Belfast, two steel meshed spheres symbolising "the rising of the sun and new hope for Belfast's future", or, as it's more popularly known, due to its location, The Balls in the Falls.

BBC: Sheep on Shoreham roundabout