Boyle also had a monogenist perspective about race origin. He was a pioneer studying races, and he believed that all human beings, no matter how diverse their physical differences, came from the same source: Adam and Eve. He studied reported stories of parents' giving birth to different coloured albinos, so he concluded that Adam and Eve were originally white and that Caucasians could give birth to different coloured races. Boyle also extended the theories of Robert Hooke and Isaac Newton about colour and light via optical projection (in physics) into discourses of polygenesis, speculating that maybe these differences were due to "seminal impressions". Taking this into account, it might be considered that he envisioned a good explanation for complexion at his time, due to the fact that now we know that skin colour is disposed by genes, which are actually contained in the semen. Boyle's writings mention that at his time, for "European Eyes", beauty was not measured so much in colour of skin, but in "stature, comely symmetry of the parts of the body, and good features in the face". Various members of the scientific community rejected his views and described them as "disturbing" or "amusing".