Fig. 7. Dependence of the polarization-induced false colour (M_R, M_G and M_B) perceived by a retina with =0°, ß_B=0° on the polarization sensitivity P_B=P_G=P_R=P as a function of the microvillar directions ß_G and ß_R of the green and red receptors (designated by letters b-m) plotted within the equilateral R-G-B colour triangle, the colourless centre of which is represented by +. The colours are calculated for a point on a leaf of Campsis radicans marked by a white vertical bar in Figs 2, 3A-C. The reflection-polarization characteristics of this point are given in Table 2. The arrows start from the spectral locus a of the real colour when P_B=P_G=P_R=1, meaning polarization-blindness, while the arrowheads point to the spectral locus of perceived false colours if P_B=P_G=P_R=P=20. The spectral loci of false colours for P values ranging from 1 to 20 are placed along the straight arrows, on which the loci for P=2, P=5 and P=10 are marked by bars.