Matter and all else that is in the physical world have been reduced to a shadowy symbolism. - Arthur Eddington

The frank realisation that physical science is concerned with a world of shadows is one of the most significant of recent advances.

There once was a brainy baboon, Who always breathed down a bassoon, For he said, "It appears That in billions of years I shall certainly hit on a tune".

It is difficult for the matter-of-fact physicist to accept the view that the substratum of everything is of mental character. But no one can deny that mind is the first and most direct thing in our experience, and all else is remote inference — inference either intuitive or deliberate.