I thought you had a good point with the hybrid pool thing, but then I typed in 'pond pool' in Google Images, and this was one of the first hits:
That looks kind of infinity-poolish too.
They start blending it all for the optimal luxurious look. Works for me
I must say your camera may be too good. I too noticed all the mold marks that tonguello mentioned.
Yeah, it's actually quite obvious on the clickies. Sad, huh? I have no idea when this started happening.