View from above of east and south-east elevations of Church Army Chapel, Blackheath, <a href="//commons.wikimedia.org/wiki/London" title="London">London</a>, <a href="//commons.wikimedia.org/wiki/England" title="England">England</a>. Built 1965. Showing curve of hyperbolic paraboloid roof. There is just enough shadow to reveal some of the underlying straight timbers of the roof, running crosswise against the curved strips of the covering material. The square patch on the roof is where the spire was fixed (now missing in 2009). The roof drainage arrangement can be seen: the water runs down the buttress, into a trough, then down into the undercroft to the site drainage system.
Linda Spashett <a href="//commons.wikimedia.org/wiki/User:Storye_book" title="User:Storye book">Storye_book</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>