Spanish-built Tecnilinea Pyramid Liner is a series of clever textured pads that allow you to draw either freehand lines or perfectly square straight lines… freehand. These templates have a small grid of 0.5 milimeter spaced lines through which you run your pen or pencil to make technical drawing almost fun, and certainly a lot faster. I can see potential for more advanced patterns through changing surfaces: perspectives, alignments… physical CAD!

[Via Compradiccion]