Black is real sensation, even if it is produced by entire absence of light. The sensation of black is distinctly different from the lack of all sensations. — Hermann von Helmholtz Copy Share Image
During the first half of the present century we had an Alexander von Humboldt, who was able to scan the scientific knowledge of his… — Hermann von Helmholtz Copy Share Image
“I have been able to solve a few problems of mathematical physics on which the greatest mathematicians since Euler have struggled in vain ...… — Hermann von Helmholtz Copy Share Image
The originator of a new concept...finds, as a rule, that it is much more difficult to find out why other people do not understand… — Hermann von Helmholtz Copy Share Image
There is a kind, I might almost say, of artistic satisfaction, when we are able to survey the enormous wealth of Nature as a… — Hermann von Helmholtz Copy Share Image
The law in question asserts, that the quantity of force which can be brought into action in the whole of Nature is unchangeable, and… — Hermann von Helmholtz Copy Share Image
What we see is the solution to a computational problem, our brains compute the most likely causes from the photon absorptions within our eyes. — Hermann von Helmholtz Copy Share Image
A raised weight can produce work, but in doing so it must necessarily sink from its height, and, when it has fallen as deep… — Hermann von Helmholtz Copy Share Image
I think the facts leave no doubt that the very mightiest among the chemical forces are of electric origin. The atoms cling to their… — Hermann von Helmholtz Copy Share Image
A moving body whose motion was not retarded by any resisting force would continue to move to all eternity. — Hermann von Helmholtz Copy Share Image
But heat can also be produced by the friction of liquids, in which there could be no question of changes in structure, or of… — Hermann von Helmholtz Copy Share Image
Windmills, which are used in the great plains of Holland and North Germany to supply the want of falling water, afford another instance of… — Hermann von Helmholtz Copy Share Image
