FWIW, I don't think the analogy you described is what many people would describe as "fairly intuitive", though I think it's a reasonable one. Still, it relies

FWIW, I don't think the analogy you described is what many people would describe as "fairly intuitive", though I think it's a reasonable one. Still, it relies on harnessing our spatial reasoning and I don't think most people are good at visualizing or reasoning about billions of marbles being sifted through billions of nets (in the case of simpler organisms) or even millions of marbles being sifted through ~7,000 nets (in the specific case of humans).