Can you draw a straight line without ruler? Here’s a Spanish product called Tecnilinea Pyramid Liner which is a series of clever textured pads that allows you to draw straight lines using freehand. These templates have a small grid of 0.5-millimeter spaced lines through which you run your pen or pencil to make technical drawing almost fun, and certainly a lot faster. They are available at tecnilinea.com. Video after the jump.