A cloud.
A cloud is about 10 yards, or 30 ft, which is about the height of a 3-story building.
Clouds can be any theoretical size, and are classified as objects.
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If it is rectangular, then 9*6 = 54 square metres.
5 meters long= possiblily a bus, limosine.... Prussia's.
9 meters
9 feet
An ordinary door.