> because I'm convinced my wife sees more colours than I do A sizeable percentage of women have tetrachromy (5% ? I forgot the exact number but it's not nothi

> because I'm convinced my wife sees more colours than I do A sizeable percentage of women have tetrachromy (5% ? I forgot the exact number but it's not nothing). AFAIR men do not have tetrachromy. So, basically, some women do actually see more colours than all the men and than most other women. Maybe your wife has tetrachromic vision? (not sure how it's called)