that depicts the example set of four plastic forms from fig8 a set adjacent to each other for framing a concrete structure of one square foot according to an embodiment fig8 c is a photograph that depicts the example set of four plastic forms from fig8 a stacked for transport according to an embodiment fig9 a is a photograph that depicts the example set of four plastic forms from fig8 a set adjacent to each other for framing a concrete structure on a wall of plywood planks according to an embodiment fig9 b is a photograph that depicts the example set of four plastic forms from fig8 a set adjacent to each other for framing a concrete structure on a wall of plywood planks with simple side framing according to an embodiment fig9 c is a photograph that depicts the example framing of fig9 b after pouring concrete according to an embodiment fig9 d is a photograph that depicts an example structure incorporating the example plastic forms of fig9 a according to an embodiment this structure provides a vaulted ceiling for the room between the two plywood planks and a floor for a story above fig1 a is a photograph that depicts the example structure of fig9 d externally loaded with a bending stress of 10 pounds plus 7 ounces of a two by four according to an embodiment fig1 b is a photograph that depicts the example structure of fig9 d externally loaded with a bending stress of 20 pounds and then maintained for 7 weeks according to an embodiment no failure by the structure is indicated suggesting that the tensile strength provided by the plastic frame suffices for a sustained external load.