Select your first piece of paper and place it on your cutting mat. Score your paper vertically at the 1-inch and 2-inch marks and trim your paper completely at the 3-inch mark. Repeat the scoring and trimming process with each color of paper.
Trim the lengths of scored paper crosswise into 1-inch strips. Cut some paper “planks,” 1-inch strips of paper that are not scored. They can be 3 to 6 inches long.
Fold your 1-inch strips into thirds along the scored lines. Tape the open edges together to form a triangle.
Repeat folding and cutting until you have a bunch of blocks assembled. Start positioning the triangles in a row alternating between triangles that are right side up and upside down.
Add a plank or two on top of each layer. When you have a few layers you can test how strong your paper structure is by balancing objects on top of it! That’s it you’re done.