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peach pit
A city could be one. For example: the nucleus of a city.
An example of a nucleolus would be a peach pit. However, a chemical nucleus is much different from a biological nucleus.
You cannot have One [The Nucleus] without the Other [Real Biologic Life].
Real life is a real life example!
a Television is a real life example of a Cube A dice is a real life example of a cube
a real life example of an octagon is a stop sign.
A real life example of a cliff are the white cliffs of Dover.
A real life example is the chloroplasts found in plant cells.
A pennant is a real life example of an isosceles triangle.
James and the Giant Peach, Arthur and the Invisibles
I real life example of a vertex would be a corner of an object like a box.