Monthly Archives: September 2014

Four Tales of Blind Travellers

Kindness is the language which the deaf can hear and the blind can see. Mark Twain   Tale 1 A year back, I visited a local charity for the blind and visually impaired. I was given the contact by my … Continue reading

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The Big Spoon, The Little Spoon and The Extra D: Experiment 14/101

Our retinas are flat and 2D, surfaces not solids. But human beings perceive the world vividly in 3D. How can it be? Where does the extra D come from? An excellent online article by David Hubel lists a whole range … Continue reading

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Aristotle’s Nose Job: Experiment 13/101

When we were very young we were shown the ‘two noses’ illusion. If you cross your fingers and touch a small object (such as the tip of your nose), there will seem to be two of whatever it is. Not … Continue reading

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On This Day

On this day 2013 I began this blog. When I was a pre-teen I wanted to be a scientist. I had a book called Boy’s Book of HEROES and several scientists made the grade. I liked collecting things and doing … Continue reading

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Three Hundred and Sixty-Five Days a Stroke Survivor

Today is my anniversary, so I was determined to make a post. Exactly one year ago, on 11 September 2014, I had a stroke. Upstairs, washing my feet in the tub, I noticed a problem with my vision and had … Continue reading

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Herr Troxler and the Butterfly: Experiment 12/101

Background Did a butterfly ever settle on your hand? What did you feel? Equipment The picture below. Experiment You see a central cross set against a blurry background pattern of pastel colours. Focus on the cross. Do not let your … Continue reading

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Dr Yeh and His Magic Picture Books

Goodnight room. Goodnight moon. Goodnight cow jumping over the moon. 3D printers open up picture books for children with visual impairment. At the University of Colorado, the Children’s Tactile Book Project led by Tom Yeh is converting children’s picture books … Continue reading

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