(a) Superposition of horizontal light sheet and a rapidly moving vertical beam is used to create attractive potentials for BECs. By translating the vertical beam in the horizontal plane, Ryu et al. can “paint” an arbitrary trapping configuration. (b) Using this technique, Ryu et al. created a potential in the form of a loop interrupted by two thin barriers. (c) Absorption image of a BEC in this potential, resembling a dc-SQUID-like configuration.