Figure 1. This is a frame grab from a video uploaded by algesolution in YouTube showing a temperature-controlled koi pond designed by Koiland. The pond has a glass window for viewing the koi on the side.  

See the video here: http://www.youtube.com/watch?v=VUTdbEmmPGk

Figure 2.  The glass viewing window of the pond.

Figure 3.  The koi as viewed through the glass window.

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