Can You Believe Your Eyes?

Published April 04, 2025 Updated April 07, 2025

“Can You Believe Your Eyes?” playing cards featuring visual illusions & other oddities.

1984 United Kingdom USA Y & B Associates Education Psychology

“Can You Believe Your Eyes?” playing cards featuring optical illusions, ambiguous or impossible figures and other oddities, published by Y & B Associates. The cards were designed by J. R. Block and Harold E. Yuker, Professors of Psychology, Hofstra University, Hempstead, N.Y. and have novelty, educational as well as entertainment value. They explore how humans perceive visual information: optical illusions challenge the brain's visual processing system, revealing how perception can differ from reality • see the box

‘Can You Believe Your Eyes?’ playing cards published by Y & B Associates, 1984 ‘Can You Believe Your Eyes?’ playing cards published by Y & B Associates, 1984 ‘Can You Believe Your Eyes?’ playing cards published by Y & B Associates, 1984

Above: ‘Can You Believe Your Eyes?’ playing cards designed by Drs J R Block and Harold E. Yuker, professors of Psychology, Hofstra University, Hempstead, N.Y. Wide cards dated 1984 by Y & B Associates. Available from Intercol London and various other outlets, sometimes with different boxes or double boxes. Printed in Belgium. 52 cards + 2 jokers + an extra card + a 16-page booklet. The design of the card backs is the reverse image of the six of spades.

J. R. Block and Harold E. Yuker contributed psychological research in the study of attitudes toward disabled persons. They developed the Attitudes Toward Disabled Persons (ATDP) scale, which became a widely used tool for measuring attitudes toward individuals with disabilities. See Yuker, Harold E. and others : The Measurement of Attitudes Toward Disabled Persons

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By Jon Randall

Member since May 28, 2020

From 6 or 7 years of age I enjoyed playing cards with my family, and still enjoy a variety of games today with various groups and individuals. I contribute my competitive nature to enjoying games … it’s not that I like to win, I dislike losing! I was barely 10 years old when my great Uncle left me a small collection of playing cards and that was the starting point of my collecting. The competitive streak in me helped develop me into a competitive swimmer that sent me to various places around the world, including a 6 year stint in the US, where for much of that time I was at university. I’ve always enjoyed car boots flea markets, yard sales, charity shops etc., and my eye would never miss a pack of playing cards. Even after my swimming career finished I coached at a high level for many years and continued enjoying the discovery of some great finds around the world. For decades my collection continued to grow, despite selling a portion of it via eBay over the years. It wasn’t until post 2010 that I realised, mostly due to correspondence with Australian friends, that there were so many single playing cards collectors. This intrigued me. I had so many packs of cards at home that I made the bold decision to share a good number with single collectors, and subsequently listed around 7000 for sale on eBay. That did make a dent in my collection, but there’s still around 30,000 packs taking up quite a bit of space at home. Crazy? Yes, but I’ve seen bigger hoards a few times! There’s so many I surprise myself finding packs I forgot I had when I look in a box I’d not seen in a while.

My eBay ID’s if you’d like to look are “worldwide_playing_cards” & “playing_cards_world

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