“…Despite assuming the relevance of the linguistic-cultural factors, and even assuming that they partially explain the differences in BCTs between languages (e.g., in their number), the universal evolution model (UE, Berlin and Kay, 1969 ; Kay and Maffi, 1999 ; Kay et al, 2009 ; Lindsey and Brown, 2014 ; Skelton et al, 2017 ) proposes that some universal factors are the main determinants of the key similarities found between very different languages (see Franklin, 2016 , Figures 2.3 and 2.4). Among these universal factors are the physical regularities of the chromatic stimuli ( Philipona and O’Regan, 2006 ) and/or the special characteristics of the opponent non-composite (unique) sensations (white vs. black, red vs. green, yellow vs. blue, see Forder et al, 2017 ; Lillo et al, 2018 ).…”