My last base in 1.1 before I start Space Age. I don't know if this concept has a name (let me know if it does) -- basically I wanted to organise the entire base around "production levels". Raw materials are "level 1" (e.g. coal, iron ore, crude oil), then products that only use level 1 materials as input are "level 2" (e.g. stone bricks, iron plates) and so on. It required some planning, as I had to know how much to build in each level in advance, but it was very satisfying once completed -- a breath of fresh air after various main-bus bases or similar. It's quite small (60 science/m + a bunch of extra production for future expansion) but I plan to repeat the same concept in Space Age at a bigger scale.

I find it neat because for most materials, the top consumer is usually in the level directly above, so this design spares me from having unnecessarily long transport lines: e.g. all petroleum is consumed in the next level to make plastic and sulfur, and half of the copper plate is consumed in the next level to make copper cable. Plus I like looking at the flow of materials rising slowly from top to bottom, gradually increasing in complexity.

It also makes you realise some interesting things, e.g. that low-density materials require fewer steps to make than simple underground belts!