Mingyue’s postcard uses oreo making stages to represent the oreo making video codes. For example, raw ingredients like flour, sugar, butter, and salt represent the problem definition code. The oreo mold pattern helps put everything together into one piece, representing how we gather information and ideas to form a cohesive whole. Fitting the dough into the mold then taking the molded cookie out demonstrates implementation and then evaluation of the ideas. The completed oreo represents making the prototype. See the back of the postcard for the key and other details!