An amusement apparatus includes an elongate member having an upper extremity and a lower extremity with a pivot point. In the robot, an arm member, a first link, a second link and a third link constitute a parallel linkage, and the first link and the third link are coaxially pivotally supported on a base. The use of the same metal nanoparticle solution in both the mask formation and the subsequent formation of conducting structures simplifies the fabrication process.