A flower in our swimming pond

In contrast to other parts of the world, summer isn't so hot this year at my place, although Freiburg is the hottest town in Germany (temperature-wise). So in my little natural swimming pond

http://michaelbach.de/misc/teich/

the temperature in the last 3 months always hovered between 20 and 24°C, today it is 20°C. These moderate temperatures and low biomaterial content in the water make life a little hard for many plants. Still, the water lily which I freshly planted several months ago now decided to come up (literally) with a beautiful blossom. It stayed over water only for 3 days, then the pedicel spiraled, pulling it back under water; blossom closed. But it's nice swimming in there every morning anyway.