Arbitrarily attributing something's properties to its constituent parts.
Believing that the parts of a whole are automatically inherit its properties.
General form:
"A is made of Bs, and all A is C, therefore all Bs are also C."
Typical example:
"This house is cubic, therefore the bricks it's made of must also be cubical."
There is no logic rule that states that the property of a collection is automatically transferred to its constituent elements.