Scale and motion towards the observer

[leapingllamas]

A number of the examples imply motion in 2D plane. I wonder if it would be useful to include simple examples that imply motion in 3D. That is, imagine a input grid with an object and where the output contains the same object scaled up (each pixel of input object become n*n in output, or vice versa) to simulate motion towards or away from the observer.

This could also be combined with 2D motion

[fchollet]

Upscaling/downscaling (not necessarily related to forward/backward motion) is featured in quite a few tasks.