An order fulfillment system and method uses a robotic arm having an end effector for grasping an object. An arcuate structure is moveable within reach of the robotic arm. A conveyor system brings inventory to the arcuate structure and takes a container that holds picked inventory away from the arcuate structure. A control system fulfills an order by directing the conveyor system to bring inventory to the arcuate structure, positioning the inventory on the arcuate structure relative to the robotic arm, determining a selected inventory item for an order, commanding the robotic arm to move the selected inventory item from a pick location of the selected inventory item to a container location for the order, and directing the conveyor system to take the container from the arcuate structure.