{"id":1641,"date":"2025-03-18T20:07:39","date_gmt":"2025-03-18T20:07:39","guid":{"rendered":"https:\/\/www.giannisarcone.com\/wp\/?p=1641"},"modified":"2025-03-24T19:56:47","modified_gmt":"2025-03-24T19:56:47","slug":"umbrella-illusion","status":"publish","type":"post","link":"https:\/\/www.giannisarcone.com\/wp\/umbrella-illusion\/","title":{"rendered":"Umbrella Illusion"},"content":{"rendered":"\n

One of my illusions from the late ’90s. Take a look at the colorful umbrellas in Figures A and B of the table below\u2014are they the same or different? About 80% of people will say that Umbrella A has jagged, zigzag edges, while Umbrella B has a smooth, wavy outline. But here\u2019s the trick\u2014you\u2019ve been fooled by the brightness contrast of the rays inside the umbrellas. In reality, both umbrellas are identical in shape, perfectly congruent.<\/p>\n\n\n

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This illusion works even when only the lines of the shapes are emphasized. As demonstrated in the table below, the outline of Umbrella A appears jagged and zigzagged, while Umbrella B seems to have, once again,\u00a0a smooth, wavy outline.<\/p>\n\n\n

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This illusion shows a phenomenon called curvature blindness<\/a><\/em>, which was rediscovered in 2017 by Japanese psychologist Kohske Takahashi<\/a>. He created a powerful variant and studied its impact on how we perceive shapes.<\/p>\n\n\n\n

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\u00a9 Kohske Takahashi – The wavy lines appear different depending on the background and how the repetitive dark color is applied to them.<\/em><\/figcaption><\/figure>\n<\/figure>\n\n\n\n

Read more<\/a><\/p>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

One of my illusions from the late ’90s. Take a look at the colorful umbrellas in Figures A and B of the table below\u2014are they the same or different? About 80% of people will say that Umbrella A has jagged,… Continue Reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[483,32,15,149,28,25,57,38],"tags":[535,536,296],"class_list":["post-1641","post","type-post","status-publish","format-standard","hentry","category-art","category-color","category-curiosities","category-nature","category-op-art","category-optical-illusions","category-paradox","category-perception","tag-curvature-blindness","tag-mind-trick","tag-visual-perception"],"_links":{"self":[{"href":"https:\/\/www.giannisarcone.com\/wp\/wp-json\/wp\/v2\/posts\/1641","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.giannisarcone.com\/wp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.giannisarcone.com\/wp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.giannisarcone.com\/wp\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.giannisarcone.com\/wp\/wp-json\/wp\/v2\/comments?post=1641"}],"version-history":[{"count":2,"href":"https:\/\/www.giannisarcone.com\/wp\/wp-json\/wp\/v2\/posts\/1641\/revisions"}],"predecessor-version":[{"id":1653,"href":"https:\/\/www.giannisarcone.com\/wp\/wp-json\/wp\/v2\/posts\/1641\/revisions\/1653"}],"wp:attachment":[{"href":"https:\/\/www.giannisarcone.com\/wp\/wp-json\/wp\/v2\/media?parent=1641"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.giannisarcone.com\/wp\/wp-json\/wp\/v2\/categories?post=1641"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.giannisarcone.com\/wp\/wp-json\/wp\/v2\/tags?post=1641"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}