I am reading a book about stairs. Maybe the most interesting thing about it is that the architect who wrote it is mainly noted for being an expert witness in injury lawsuits involving stairs. I think there are a few logical slipups and some assumptions about architectural intent that seem specious to me. But the book is also missing a few pages, which were neatly removed so that I didn't even notice before I bought it. One page that is missing has an illustration of an industrial staircase that has alternating left and right treads, so you have to start with the same foot every time. I kind of want to see how that works, sort of like the alternating pegs on a telephone pole. I'm not sure if it would be an improvement on our spiral stairs but it might be. After hearing our guests go up and down them last weekend with some difficulty, it is on my mind.