Blank, interactive cards for all occasions: Produced through die-cutting, the pattern on the card is easily changed, while the format remains the same. Each card weighs less than an ounce, for easy mailing; and can be mailed with a dowel to complete assembly. No additional tools or materials needed.

Early studies explored different interactions and formats. 

The final design uses the maximum dimensions for normal letters. In the drawings below, long dashes indicate perforations, while small dashes indicate score lines.