After a meeting with the head rabbit in the oslaw (the form of government/police in the warren) Fiver is walking back to his hole with his friend blackberry when he sees a sign advertising a condo that is being put up. Obviously since hes a rabbit, he can’t read it but is still suspicious and it makes Blackberry wonder if it has any correlation to the vision Fiver had. This is a another example of the theme because the building of condos and other high rise residence buildings are a big environment destroyer, and the number of them is only increasing .