We don't have those tweezers we often dream of at night...that would allow us to pick up a segment, hold it firm and straight, and paste it in the right direction on the segment that has already been assembled. If we had those tweezers...we would have managed to create some lovely things.
Primo Levi, The Monkey's Wrench
electron microscopy photographs of concrete specimens provided generously by Majed Karam. From 'Offsetting Cold Temperature Effects During Concrete Setting Using Cryophilic Microorganisms'