Perot Museum

Perot Museum

Wednesday, February 18, 2015

Geometry on Plastic Canvas


By Juan Torralba
In the Latin culture, center pieces and arrangements on the tables at celebrations are usually created for the guests to take home after the celebration. Generally, these are made for quinceaneras, baptisms, and baby showers. One of those arrangements are the ones made using plastic canvas and yarn. And while they can be time consuming to create, people are always looking forward to them. There are so many different designs that can be made that you can never have too many of them. In almost every traditional home, you can find one of those arrangements or least the people will know exactly what you’re talking about if you mention it. 

There are so many geometry concepts involved in creating these designs and people aren’t usually aware of them when they create them. So my idea for STEM Day, which was to be something fun with geometry, was to have the students create some of these plastic canvas designs and learn about the geometry behind it without explicitly teaching it to them.




I chose this activity mainly because it’s something many of the students can relate to, it’s very hands-on, and it was something the kids could not only take home but also continue doing on their own. As mentioned before, I wanted the students to learn about the geometry behind those designs. Many of those designs are tessellations which involve many concepts such as symmetry, similarity, congruency, transformations and so many more. In addition, each design came with a list of materials, which gave the students specific measurements of each color of yarn needed and the area of plastic canvas needed as well. The students would have to measure everything themselves and select the appropriate canvas size for their design.


That was the goal, however, things did not go as well as I planned it. The first problem we encountered was that some of the students came in after we had explained some of the instructions, so we had to wait for them to select their designs and materials before we could begin teaching them how to cross stitch the yarn through the canvas. That process was not supposed to take very long, since it was a relatively simple over and under type of stitching. However, I had two out of the four students I was helping who simply did not understand that process. The other two students, which happened to be girls, understood the process rather quickly and began to work on their design. While the two struggling students, which happened to be boys, took 5 to 10 minutes to figure it out. Another problem was the detail of the designs we selected. The designs my students selected were mainly composed of single cross stitch, which takes a lot longer than the other ones available. So, naturally, we ran out of time and the students left with incomplete designs.



What went well was that we had all the necessary materials and designs with instructions on them, which made the selection process and gathering of materials quite smooth. Another thing that went well was that the students who basically mastered the art of cross stitching loved it so much that they stayed an extra hour to finish their design. One of my actual student who attended the STEM Day, brought to class some of the other designs she created over the weekend and told me how much she enjoyed working on them. 

If I were to do this again, which I plan on doing, I will assign it as a project, rather than a lesson or one day activity. I would probably give my students a short instructional video on how to start and finish stitching as well as other little details they may need to know once they start working on their designs. I would definitely give them plenty of time to complete it in order to allow them to be as detailed as they want with their designs.  

Here are some of the links that will help you learn simple cross stitch, find the materials, and get some ideas of geometric creations your students can work on.



Resources

How to cross stitch

How to start and end a strand of yarn




Designs

Materials
 

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