Watch koi fish wander and school beneath rippling reflective water, among floating lily pads. This scene models real koi (Nishikigoi) behavior: they cruise slowly near the surface, cluster loosely ("schooling") without a strict formation, and undulate their bodies in an S-curve to propel themselves, exactly like true carp locomotion. Koi colors — orange (Kohaku), white/black, and mixed patterns — are the product of centuries of selective breeding in Japan starting in the 1820s. The rippling water uses a vertex-displacement shader to approximate real wave interference and a Fresnel-like term to fake reflectivity, echoing how real pond surfaces scatter and reflect light depending on viewing angle.
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