Concrete blocks are prefabricated materials primarily used for constructing walls. Similar to bricks, these blocks are stacked together and bonded with mortar, typically composed of cement, sand ...

Dubbed “bio-blocks,” they offer a zero-carbon substitute to their concrete alternatives and were engineered by Prometheus Materials and the Chicago-based architecture firm Skidmore, Owings ...

And there are 5,000 of them. Portland artist Aaron Stephan made them all by hand for a temporary installation in Portland: a field of concrete blocks in a vacant distillery in Thompson’s Point ...