The reflection effect of horizontal surfaces

[South8028]

I accidentally noticed that during the rain, some horizontal surfaces form real reflections of the geometry. As if in the game, under certain conditions, something similar to ray tracing technology works. If some effect exists, then you can probably find a princip and repeat it artificially. This would allow real mirrors to be introduced into the game, instead of these unpretentious cube maps.

Are there people skilled enough in ce technology to explain this effect?