In order to focus the light beam in the best possible way, there is usually a large, characteristic lens or - in the case of LED beams - a lens plate at the light outlet. The devices often have similar features to their spot or wash counterparts, for example gobo wheels, but combine them with a much smaller beam angle. Thanks to 2 rotatable axes (PAN/TILT), the light beam can be positioned and moved freely in the room. By the way, beam moving heads are real pack animals: Several devices in combination are perfect for massive fan effects and beam shows.