Nature Aided Design Lab creates unique street furniture pieces using the power and variability of the Thames in London, one of only two tidal rivers in the UK. A flexible mould containing a concrete mixture is attached to floating buoys and shaped using the tidal forces and currents. The mixture hardens and freezes the form after a certain time and is revealed and harvested during low tide. This is a self-sustained repeatable production system where we manipulate the energy and variability of Nature to grow objects which are revealed during the low tide. The final form can be “predicted” using an interactive program developed by Nature Aided Design Lab. Preset constraints, tidal rates and macro currents can be inputted to give an idea of the desired form. However, the inherent unpredictability of nature will also have an effect which cannot be foreseen.