A method for continuously annealing a steel strip includes annealing the steel strip in a vertical annealing furnace, an atmosphere in the furnace being separated by a partition disposed within a space spanning from the heating zone to the soaking zone. Additionally, a coaching method provides haptic-based feedback that will not interfere with the operation of the vehicle. The illumination pattern provided to the fluid is controlled by controlling the phase of the light in the first plurality of surface waveguides.