Why would anyone go to the trouble to shape this Pond as a Kidney?

  1. 417 Posts.
    lightbulb Created with Sketch. 12
    Or any Body Part for that matter?
    https://hotcopper.com.au/data/attachments/6416/6416403-50ca6c9c03fafe8b711f32962c55ba7f.jpg
 
arrow-down-2 Created with Sketch. arrow-down-2 Created with Sketch.