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http://warsawimprov.pl/wp-content/uploads/2017/04/bistable1.jpg
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How many ingots?

Arrr these helms in a storm?

https://cdn.cnn.com/cnnnext/dam/assets/150227114858-illusion-spinning-circles-super-169.jpg

https://i2.wp.com/www.theinspirationblog.net/wp-content/uploads/2010/09/illusions-3.jpg

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Whose portrait arrr these?

.... share other Eye Tricks ye have uncovered ;'D