Chalk Reflektor Meaning

These things - chalk REFLEKTOR logos, which I saw a couple of young students drawing all over Wapping (and a couple in Southwark) - months ago - turn out to be a lovely bit of viral marketing for this album (pictured below) by some Canadians -

- so there we go, mystery solved...and well done for drawing my attention... ;)

Mysterious Chalk Drawing - Balfe Street

Spotted this the other day, on the pavement outside one of the houses in Balfe Street...any ideas? The writing says "Artificial"...

Definitely a technical drawing of some kind, but what of, I wonder? It reminds me of the "idiot's guide" animations they do on Scrap Heap Challenge (to explain the mechanical principles to the layman)...