In her postcard, Aishwarya uses ingredients on a shelf to depict the oreo making video. Each shelf represents one of the coded stages, and the number of ingredients on a particular shelf indicates the complexity of ingredients for a particular stage. As the baker figured out her ingredients and process, the number of ingredients per shelf reduces, concluding with the completed oreos and milk on the final shelf. See the back of the postcard for the key and other details!
