Easter Parade 2023 イースターパレード

New York’s Easter parade is a spring ritual. You might have seen it in the Hollywood movie starring Judy Garland and Fred Astaire, it’s become a tradition to make special hats and walk down Fifth Avenue. We have been participating in this event by making new origami hats each year. We have not joined Since 2018  due to the pandemic. There was a parade last year, but it was too rushed to have time to come up with a new design-but we had plenty of time this year and decided to try something a little different.


Until now, the theme of origami hats was to make interesting hats using only folding patterns. This time, the idea is, ”if you make a pattern on the paper, wouldn’t that be even more interesting?” If you think about it a little, you’ll understand that the folding pattern and the pattern are completely independent and can be superimposed in any way. Therefore, the challenge lies in how to synchronize them to create an interesting hat.


So far, most of our origami hats have expanded a little beyond the origami definition. True origami can be unfolded into a perfectly flat piece of paper, but our origami hats can be unfolded into cones. In other words, it becomes “a completely flat piece of paper by cutting it only once” (see Figure 1). This might be called extended origami. A simple closed two-dimensional curved surface can be opened with scissors to create a perfect plane, but there may also be complex objects that cannot be laid out into a plane with a single cut. (By repeating more cuts, we may be able to define a higher-order “extended origami”, such as cutting 2-times, 3-times, or more……. Some examples are shown at the end of this post.)


Fig 1

Now, one of the hats is shown below with a single cut and unfolded (or conversely, before the edges are glued together). The black pattern that looked complicated was a simple stripe.


Stripes, will always work on origami like this? The answer is no. A semicircular shape is a critical condition. If it is an arbitrary fan shape instead of a semicircle, the stripes will not be smooth and will have an angle (see Figure 2) when the edges are connected.


Fig 2

Then, are there patterns other than stripes that are smoothly continuous when connected? We tried to apply other patterns for some of the hats. Can you visualize it? Then, are there others? Yes, anyone can come up with a concentric black pattern. You can also forget about synchronizing and make one half all white and the other half all black, or even a panda pattern, but we thought they are not as much fun. The original paper does not have to be a semicircle, a fan shape may be possible with new patterns. New ideas came up on the way home from the parade. Hopefully, we can show some of them next year.


Appendices, 付記

Below is an example of origami that can be flattened with scissors. These were devised in the creation of internal spaces using origami and also the development of objects that fill space infinitely, but we rearranged them under the category of “extended origami”. (There is a difference between whether cutting with scissors can extend the paper to a flat surface regardless of where the cut is made, or whether the scissors can do it only in a specific location. So, it seems that it will not be so simple.)


extend with one cut (at a arbitrary location ) 1回ハサミ入れで展開(任意の位置で)
extend with one cut (at a arbitrary location ) 1回ハサミ入れで展開(任意の位置で)
extend with two cuts ( at specific locations) 2回ハサミ入れで展開(特定位置で)



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