Thanks, Ken. Tonal illusions are endless, but one of my favorites is Koffka's.
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I am really enjoying this series of this young lady. Thank you for sharing them.
I don't own "The Print" by Ansel, but I have this quote from it penciled into one of my Frederick Evans books: "...we cannot equate brilliance with contrast. I recall about twelve years ago measuring the reflection densities of several of Frederick Evans' platinum prints from the late nineteenth century, which conveyed an astonishing sense of brilliance. Much to my surprise, I found that the actual range of reflection densities was..., far lower than I had expected. The apparent brilliance of the prints was explained by the subtle relationship of values, rather than by actual contrast."
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