human
Make a concise location description of a spooky interior of a lighthouse with birds, iron bars, and stairs.
assistant
Within the tapering interior of the stark, ramshackle lighthouse, birds nest in the chinks of the masonry. Narrow, unglazed windows open to the salty air of the sea and the shrilling of gulls beyond. A spiral of stairs twists its way to the top -- a mere frame of thin iron bars welded together, the joints flecked with rust.