The present invention relates to a method for the production of abulk of molten steel in an electric arc furnace, comprising the formation of a foaming top slag. The liquid prisms may be configured to selectively modulate a direction of the transmitted light relative to the incident light so as to selectively alter an angle at which an image generated by the image display element is projected to an observer. Other embodiments are described and claimed. Also, through different positioning of the intermediate elements, the heel support can be arranged diagonally relative to the longitudinal axis of the snowboard binding.