AR-Jig is a new, handheld, tangible user interface for 3-D digital modeling. AR-Jig has a pin array that displays a 2-D physical curve coincident with a contour of a digitally displayed 3-D form. It allows physical interaction with a portion of a 3-D digital representation, allowing 3-D forms to be touched and modified directly. In contrast to traditional tangible interfaces, which physically embody the entirety of data, this project leaves the majority of the data in the digital domain but gives physicality to any portion of the larger digital dataset via a handheld tool. This intersection of tangible and digital tools results in the ability to flexibly manipulate digital artifacts both tangibly and virtually.