There is also the convention of the pyramid, with greater order as you go up and chaos at the bottom. Not exactly parallel to this network, but I do picture the

There is also the convention of the pyramid, with greater order as you go up and chaos at the bottom. Not exactly parallel to this network, but I do picture the tip of the pyramid as the output. Another way that this "upside down" way works for me is that this isn't water flowing downhill, it's being pushed up with every layer of the network adding energy or input. Finally there's the metaphor of the roots of a plant being under the fruit of the plant. (I didn't read the reddit post, apologies if it's a duplicate or these examples are addressed there.)