Online numerous sites illustrate where and how you can find the Golden Section in human body, art and nature.[br]Often is claimed that the proportion [math]\frac{forearm}{hand}[/math] equals [math]\Phi=1.618[/math], wauw![br]But what does Leonardo da Vinci writes?[br][list][*]The distance elbow-finger tips = [b]1/4[/b] = 0.25[/*][*]The length of the hand = [b]1/10[/b] = 0.1[/*][*]So the length of the forearm equals 0.25 - 0.1 = 0.15[/*][*]And finally the proportion [math]\frac{forearm}{hand}[/math] becomes [math]\frac{0.15}{0.1}=1.5[/math][/*][/list]Well, 1.5 isn't really 1.618 but for [math]\varphi[/math]- and [math]\Phi[/math]- believers this isn't a problem.[br]We'll just draw the [math]\Phi[/math]-mark somewhere in the hand and who will check and compare both drawings?