In addition to the nails, clay slip is the glue of natural building. Anytime cob is attached to stone, wood, plastic, metal (or anything else other than cob itself), the non-cob material is coated in clay slip to help with bonding.
Kids love cob:
Even babes love cob:
I always enjoy how the gorgeous and artistic a dry-stack foundation looks once there is a nice bond beam of cob running over it.
I went to pick up a couple concrete blocks from the urbanite field this morning and was greeted by a flock of geese!
Mike ripping the tarp with a monster load of cob:
The walls go up quickly with a "bale-cob" system (a hybrid of a strawbale and cob wall). Notice the first course of bales under the blue tarp below: