My response to a person who acted hostile after I told him that there really is design in nature. I think denying such is bizarre and wrong, and really just a terrible line of argument. The truth is a far better argument for reality anyhow.
Let a beach exist for a billion years. It will stay a beach. It will change a bit and the shore will move. But, there's nothing really designing it. Let some reproducing creatures exist for a billion years and they will develop new designs and adaptations and forms that one could never imagine.
Evolution is a process of self-design, and beaches do not evolve in that sense. They are not designed. They are not improved.
There really is a difference which calls an explanation and evolution is that explanation. There is a very real difference between beaches and birds.
It's certainly true that evolution is the answer, but the question is why is there so much design in nature. Birds have insanely adapted well adapted form, hollow bones, light feathers, amazing lungs, huge pectoral muscles, and that can't have just happened or happened by chance. And it didn't they evolved. The design is the result of the system of reproduction and death.