العالم مؤلف فهو حادث كالبيت
The world is composite, so it is originated, like a house.
Here the house is the original case, whose origination is taken as known. The world is the new case. Being composite is the unifying feature proposed for both.
This classical example illustrates the structure of analogy. Its conclusion requires the further substantive premise that being composite is indeed a sufficient ground for origination; the analogy alone does not establish that premise.