Glass Perfume Bottle

Deep blue glass perfume bottle with a glossy dark cap, on the edge of a dark pedestal, rippled blue caustics filling the shadow beside it.
The same bottle in deep red, its caustics reading darker and softer against the pedestal.

A glass perfume bottle in two color variants. Light passes through the liquid and lands as real caustics on the surface below — simulated in Blender, not painted in afterwards.