What type of house weighs the least?

Common Wrong Answers
“A dollhouse”
While a dollhouse is indeed light in weight, it is not a type of house that is commonly recognized in the same context as a lighthouse.
“A treehouse”
A treehouse, although it can be lightweight, is still built from materials that weigh more than the concept of a lighthouse, which is a structure primarily supported by light.
“A cardboard house”
Although a cardboard house may be light, it is not a traditional type of house like a lighthouse, which is a specific structure designed for navigation.
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