Critique of Judgement by Immanuel Kant Chapter 22 Page 9

The regularity which leads to the concept of an object is indeed the indispensable condition (conditio sine qua non) for grasping the object in a single representation and determining the manifold in its form. This determination is a purpose in respect of cognition, and in reference to this it is always bound up with satisfaction (which accompanies the execution of every, even problematical, design). There is here, however, merely the approval of the solution satisfying a problem, and not a free and indefinite purposive entertainment of the mental powers with what we call beautiful, where the Understanding is at the service of Imagination and not vice versa.

In a thing that is only possible by means of design, — a building, or even an animal, — the regularity consisting in symmetry