My favourite example is the astonishing pace with which reverse-rendering technology has progressed. It started with a paper by NVIDIA showing projections of 2D photos being "fitted" into a 3D volume of differentiable hashtables, and then the whole thing exploded when Guassian Splats were invented. I full expect this niche all by itself to generate a huge variety of practical applications. Computer games and movie special effects, obviously, but also AR/VR, industrial uses, mapping, drone navigation, etc...