This document discusses several topics related to design and access in cities, including:
1) Segregation patterns in many US cities from the 2000 Census, with racial groups often clustered in separate neighborhoods.
2) An 1854 example from London of Dr. John Snow tracing a cholera outbreak to a contaminated public water pump on Broad Street.
3) The concept of public space as areas generally open and accessible to people, like roads and parks, and how privately owned buildings can still impact the public visual landscape through advertising.