I need to make a sponge. The kitchen kind, not the cool mathematical surface.
I've tried making it using an isosurface with f_noise3d. It looked almost, but
not quite, entirely unlike a sponge. The second thing I tried was making a
script to show a huge number of spheres clipped by each other and the rectangle
that contained them. That one was recognizable as a sponge, but barely. It's
going to be the main part of the picture, so I can't just use a spongy texture.
All I can think of is essentially using an actual picture of one. Any ideas?

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