Here's something mildly interesting:
Any phrenologic examination based on images requires topographical analyses. Topographical analyses based on images without knowing the exact angle of light source is a shitshow even in multi-scopic analyses. If They did have a proven methodology to analyse topography based on monoscopic sources without knowing the angle(s) of the light source(s), I'd want to know everything about it because I know some people who would lose their shit if this was possible. Forget about gaydar, that's a billion dollar algorithm if it exists.