Genes don’t directly create complex structures in the way you are thinking. Rather these patterns arise via emergent effects of proteins interacting and resisti

Genes don’t directly create complex structures in the way you are thinking. Rather these patterns arise via emergent effects of proteins interacting and resisting each other across populations of cells.[1] So really what you might have is a certain neuronal cell type that sends signaling molecules that cause it to divide in a very particular way that could roughly create a structure similar to a face detecting filter. If cells can grow into bones or coral reefs, why not face detecting neurons? [1]https://www.hindawi.com/journals/ddns/2020/2308074/ https://www.hindawi.com/journals/ddns/2020/2308074/