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 By placing different components of the house on a four bar structure it is possible to make the structure transform both in shape and size. some pictures of four bar mechanisms: 
 
 
 
              
 
 
 
 
 
 
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 By placing different components of the house on a four bar structure it is possible to make the structure transform both in shape and size. some pictures of four bar mechanisms: 
 
 
 
              
 
 
 
 
 
 
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