The most intriguing display to me was the exhibit named Vanishing leprechauns. It was a puzzle made of 3 pieces. 2 on the top and 1 on the bottom. It fascinated me a lot because, when the puzzle was complete there were 15 leprechauns, BUT when you switched the top 2 puzzle pieces, there turned out to be only 14. It was an illusion when an illusionist drew a picture and cut it out in a clever way.