There hasn't been a picture for a while. What there has been is an attempted return to the guiding principles developed at the dawn of blogtime - simplicity, speed, conciseness. But I said recently that I delight in diversity...
... although I just drew this picture, everyone should remember these images from basic school science classes. So let us visualise each blog post as an atom.
A is for Air. These are the random blogs that I may like to read but only if I like the blogger. There are all sorts of subjects mixed together, almost nothing connecting them.
B is for Boron (or any other metal, but that one seems appropriate). This would be a very structured homologous blog. All posts basically cover the same subject area.
C is for Common Sense. Actually it is for any blog like this with lots of very long threads, all twisting and merging and diverging. Those that have more internal cross-links tend to have greater structural strength. This one is definitely less like Polythene and more like Nylon.
D is for DNA. The ideal. Only a couple of threads, but they match together almost perfectly. And the replicating pattern seems to take on a life of its own. See, I told you this blog was holistic :)