We don't have the power to design embryos, but we do analyze the "code"—the genetic instructions and the operation of the developmental programs that take the egg from embryo to adult. We look for algorithmic elegance and simple procedures that lead to the impressive complexity of form, and sometimes we see it; there is often a kernel of clean, simple molecular interactions that lay down a framework for the organism. However, what we more often see is the action of the invisible hand of evolution: the evidence of random accidents that have been incorporated into the code, of elaborations built of bricolage, a collage of bits and pieces assembled into a larger structure. Life is a collection of kludges taped together by chance and filtered by selection for functionality;