Glass pool sunshade

I am pondering a shade structure which is outside a building. Beneath in the shade are people waiting for rides, eating lunch etc. This structure has windows which are horizontal. The windows have white leaves on them which produce shadows below in the shape of leaves. Nice!

I propose a similar thing could be done but using a shallow pool. The pool itself would be the shade with a clear glass bottom. The water in the pool would attenuate the light coming thru. Within the pool would be fish, which would cast shadows. Other items could be added to the pool - floating on the surface or resting on the bottom - to produce interesting shadows. A splashing fountain would make some pretty wild and chaotic shadows - probably too edgy for the oldsters I see here waiting on rides but maybe appropriate for other venues. Other possibilities include colored water and bubbles.

At night there could be lights on top of the fountain, lighting the area below and again producing interesting shadows.