Hidden Pool # 1
The roll away lid.
The finish on the lid top can vary a lot – from grass to patio stones and more
Hidden Pool 2
The pool bottom that moves up and down.
Image Source (Source 1 | Source 2)
Hidden Pool 3
Image Source Hydrofloor. (Source)
Hidden Pool 4
Image Source by Hidden Water Pools
There are other design sucha folding floors and you can find images of the at the original article.
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