Tag: Dr. W. Grey Walter

Self-recognition and the Mirror Dance [Image source: An Imitation of Life,  Scientific American, May 1950, p42-45.] 7 . Self-recognition. The machines are fitted with a small flash-lamp bulb in the head which is turned off automatically whenever the photo-cell receives an adequate light signal. When a mirror or white surface is encountered the reflected light …

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I have only come across two time-lapse photographs with both ELMER and ELSIE. One has to be careful in interpreting time-lapse photographs as there are possibly different events happening at different times, off picture interference, and possibly different start times of each tortoise. An important observation highlighted by Owen Holland is the direction of rotation …

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