I get really disorientated doing those stairs. You get into a zone about 2/3 the way up where you just assume it goes on for ever as it's just a uniform spiral

I get really disorientated doing those stairs. You get into a zone about 2/3 the way up where you just assume it goes on for ever as it's just a uniform spiral dotted with the occasional tourist who can't read "15 story building".