Nevermind. Just read the docs of the `get_func` function:
'''return function of [0,1]^2 -> intensity \in [0, 1]^c'''
'''return function of [0,1]^2 -> intensity \in [0, 1]^c'''
Despite the randomness in the weights, there's structure and coherence imposed by the activation functions and the manner in which activations are combined (the network architecture). There's nothing inherently magical going on: take a rational function with random coefficients and do domain coloring [1], and you'll get something interesting, too.