Two things - First the Psychological and Physiological Phenomenon Demonstrated On The Second Windmill Image. If One Stares At The Rotating Windmill On The First Windmill Image, Clouds Appear Animated On The Second Image. The Second Thing Is The Use Of Rotation Modifiers To Gradually Increase The Rotation Speed Of The First Windmill. Lisah, My Late Girl Friend Providing The Background Vocal For The Little Show...
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