additive
A method of agglutinative or serial design involving asymmetrical plans and elevations, where the interior spaces and volumes are suggested by, and even dictate, the exterior treatment of projections, roofs, and other features. Derived from the theories of A.W.N. Pugin, additive design can also include accumulation (suggesting a sequence of building additions of different styles and periods). 2. Any substance other than cement, water, or aggregate, added to a concrete or mortar mix to alter its properties or those of the hardened product. 2. Characterized or produced by addition, accumulation, or uniting, often resulting in a new identity. (Curl & Wilson, 2016)