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This template was considered for deletion on 2020 March 22. The result of the discussion was "do not merge".
What is the rational behind placing the list on a different line, "above", from the title/headline? Hyacinth (talk) 09:05, 12 October 2014 (UTC)[reply]__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2014-10-12T09:05:00.000Z","author":"Hyacinth","type":"comment","level":1,"id":"c-Hyacinth-2014-10-12T09:05:00.000Z-List_placement","replies":[]}}-->
3D Ambigrams (like in the cover of the book Gödel, Escher, Bach) are clearly optical illusions. But also all 2D rotational or mirror words revealing an unexpected message. Ambigrams are ambiguous images, made of text.
Perceptual shift ambigrams are also optical illusions. And figure-ground ambigrams (exploiting the negative space) as well. -- Basile Morin (talk) 00:17, 29 August 2021 (UTC)[reply]__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2021-08-29T00:17:00.000Z","author":"Basile Morin","type":"comment","level":1,"id":"c-Basile_Morin-2021-08-29T00:17:00.000Z-Ambigram","replies":["c-HouseOfChange-2021-08-29T00:51:00.000Z-Basile_Morin-2021-08-29T00:17:00.000Z"]}}-->
There is a difference between a visual pun and an optical illusion. The ambigram MOM/WOW, just for example, is not an optical illusion. This template links to various clear examples of optical illusions, including "ambiguous image." Adding a new link to ambigram isn't helpful. What do others think? HouseOfChange (talk) 00:51, 29 August 2021 (UTC)[reply]__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2021-08-29T00:51:00.000Z","author":"HouseOfChange","type":"comment","level":3,"id":"c-HouseOfChange-2021-08-29T00:51:00.000Z-Basile_Morin-2021-08-29T00:17:00.000Z","replies":["c-Randy_Kryn-2021-08-29T03:02:00.000Z-HouseOfChange-2021-08-29T00:51:00.000Z"]}}-->
They do seem a bit different than many other optical illusions, but the connection is well sourced. Most optical illusions are purposely created, and these creations likely fall into that category when discussed in the sources. Randy Kryn (talk) 03:02, 29 August 2021 (UTC)[reply]__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2021-08-29T03:02:00.000Z","author":"Randy Kryn","type":"comment","level":4,"id":"c-Randy_Kryn-2021-08-29T03:02:00.000Z-HouseOfChange-2021-08-29T00:51:00.000Z","replies":[]}}-->
Thanks for your remarks. The wow / mom ambigram is like the Necker cube : some will think of it as an ordinary cube, however, it is clearly an optical illusion. According to many publications I could read, ambigrams are "cognitive illusions", part of ambiguous images. Prefix ambi- means "both". The table below shows some similarities. -- Basile Morin (talk) 10:26, 29 August 2021 (UTC)[reply]__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2021-08-29T10:26:00.000Z","author":"Basile Morin","type":"comment","level":1,"id":"c-Basile_Morin-2021-08-29T10:26:00.000Z-Ambigram","replies":[]}}-->
Optical illusions : similarities between ambiguous images and ambigrams
In short, ambigrams are just special cases of ambiguous images, and thus should be included in the template, IMO. -- Basile Morin (talk) 10:26, 29 August 2021 (UTC)[reply]__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2021-08-29T10:26:00.000Z","author":"Basile Morin","type":"comment","level":1,"id":"c-Basile_Morin-2021-08-29T10:26:00.000Z-Ambigram-1","replies":[]}}-->
Basile Morin I respect your hard work on this topic and have un-reverted your addition of this somewhat ambiguous item to this already too-long list. I only hope that the list will not accrete further with special cases of optical-illusion categories that were already included on the list. HouseOfChange (talk) 14:01, 29 August 2021 (UTC)[reply]__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2021-08-29T14:01:00.000Z","author":"HouseOfChange","type":"comment","level":1,"id":"c-HouseOfChange-2021-08-29T14:01:00.000Z-Ambigram","replies":["c-Basile_Morin-2021-08-29T14:28:00.000Z-HouseOfChange-2021-08-29T14:01:00.000Z"]}}-->