A system for supporting a mobile device is described. The system includes a base and a top collapsibly coupled to the base. The top is configured to retain the mobile device and to lock at an angle with respect to the base. The angle has a vertex and is at least forty-five degrees and not more than one hundred degrees. The top and the base are configured such that a center of mass of a combination of the mobile device and the system is a nonzero distance along the base from the vertex of the angle and such that the combination is stable with respect to rotations around an axis including the vertex for the base being supported and oriented perpendicular to a direction of local gravity.