human
Write a detailed description of a enchanting scene inside a tower with a contraption and a lens.
assistant
The curve of the expansive, smooth stone wall of the tower is broken up by pointed arches leading to light-filled chambers. A bulky contraption, partially concealed with a swathe of torn sailcloth, is installed on a raised wooden platform. A magnificent glass lens mounted on the top of the contraption harnesses the colorful light spilling from the chambers and projects a beam upward, slicing into the darkness overhead.