Sometimes, in life, what is most interesting is just beneath your feet. No where is this as clear as in Berlin. The streets are not only paved with concrete and asphalt, they are often also still made of cobblestone. The sidewalks are also never one singular unit, but have different stones to make the bike lanes, crosswalks and various patterns.
I have seen workmen laying these stones many times: the stones are laid out organically in a bed of sand which means plants and weeds and flowers can push their way easily to the surface. Tree roots sometimes cause a bulge in the stones, like some giant mole is trying to break through the ground.
These streets are where I ruin my heels and wear my boots to a nub. On these streets is where I'm raising my children.