Monday, February 9, 2009

Greener than Green

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This photo of the Weyba River is taken from my verandah. Every day there are innumerable moments when I turn my head and catch this view. And every day I count my blessings.


In the late afternoon as the sun slips lower in the west the eucalyptus gums and bush on the eastern river bank light up. There is a small window of time when the colours intensify and the greens of the trees and the shadows they cast, become so green they are almost surreal.



This phenomena occurring at dusk is called the Purkinje effect. It happens when the light sensitive systems in our retinas work in tandem. We have two sets of light receptors, the cones and the rods. They usually work independently of each other; the cones in the day and the rods at night.


The phototropic cones are colour sensitive while the scotopic rods do not distinguish colour but respond best to blue and green light. That’s why at night when the rods function we are virtually colour blind.


At dusk as the intensity of the sunlight dims there is a transition between the cone and rod systems. The rods start to take over our vision before the colour disappears completely and then for a brief time the two different receptors work together producing this vivid bright green effect.


While my photograph doesn’t capture the intense green light on the trees it does show how they become beautifully illuminated. In this photo there are also storm clouds circling overhead providing added contrast. Some stray cormorants are making a tardy homecoming to roost in the gum trees with the rest of their flock.



I think that today I will give thanks for the wonders of green with this poem by e.e.cummings:





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13 comments:

  1. What a blessing to have views that anchor our soul to a physical place. Your description makes me want to come visit, to surrender my own view of a pond where bald eagles fish for trout, at least for a little while.

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  2. Hi Meri, It is a rare river, but then a pond with eagles and trout doesn't sound too bad!!! We also have two pairs of brahminy kites, one pair has been nesting in the tree opposite for nearly 25 years. Thankyou for your poetic comments...

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  3. Such a wonderful place you live in. And to think you're there to SEE it, breathe it in. It calls to mind a poem, Entering the Kingdom by Mary Oliver. I'll post it on my site.

    Thanks for sharing. I hadn't really understood the Purkinge effect before.

    And that e.e. cummings poem was another of the few I could understand when it first crossed my path, thus becoming an instant (but lasting) favorite.

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  4. Good morning Dan: It's great that we can trigger each other's memories ~ and feed of each other's comments. I'd love to see the poem.

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  5. I think i know the green you speak of, the kind of green that appears after a summer thunderstorm. You are lucky to have your view; here i am happy to see a bluejay at my garden. i must remember the Purkinge effect.

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  6. Wow! What a view! You are so lucky for two reasons. Firstly, your home looks out on such a view. Secondly, you have the perceptive skills necessary to appreciate what lies in front of you. Not everybody does.

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  7. Welcome to my place runmotman and thanks for adding your piece. I will come and visit you for bluejays!

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  8. Good afternoon YP, hope your wife is feeling a little better....not spinning out so much today...
    Its hard not to notice this beauty but then some people live in a different world don't they. But I have never had anyone walk in my front door(we have a glass style house that you can see through)and not go WOW...

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  9. Aah so that is what it is..now i understand Why this time of the day always seems to be so magic..long shadows and vivid green my favorite.

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  10. Hi Mona, great isn't it but hard to capture by camera.

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  11. What a front porch view!
    I find the late afternoon sun rather mysterious looking. An otherwordly light that takes your breath away.

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  12. and the word verification was "mystic"!!

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