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Optical illusion: Spiral (colour litho)

IMAGE number
LLM5206009
Image title
Optical illusion: Spiral (colour litho)
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Artist
English School, (20th century) / English
Location
Private Collection
Medium
colour lithograph
Image description

Spiral. Look steadily at this diagram, and give the card a rotary motion to the right. What in reality is a spiral appears to become a series of concentric circles revolving around a white centre. If the rotary motion is reversed, the circles will appear to be revolving to the left. The quicker the card is rotated, the faster the circles appear to go round. Illustration for one of a set of cigarette cards on the subject of Optical Illusions, published by Ogden's, early 20th century.

Photo credit
© Look and Learn / Bridgeman Images
Image keywords
optical / cards / historical / cigarette / card / history / illusion / illusions / spiral / educational / visual / perception
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Asset - General information
Largest available format 1771 × 3357 px 1 MB
Dimension [pixels] Dimension in 300dpi [mm] File size [MB]
Large 1771 × 3357 px 150 × 284 mm 1.3 MB
Medium 540 × 1024 px 46 × 87 mm 768 KB

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