This is one example of many castles in the medieval time period. There were many parts to a castle. But, it depended on how the castle was built to recognize parts that did and did not appear on the castle built.
Like spray paint, these markers give off volatile organic compounds. Some of the most recently made permanent markers are made from recycled plastic.[citation needed] The permanent marker was invented in 1952 by Sidney Rosenthal.
The green markers are designated by the Michigan Historical Commission. On the front of a building on the south side of Maumee Street, between Winter Street and Main Street, there is a marker that designates the location of Thomas Cooley's first law office, which he established in 1848.