Inquiring Minds

As we worked on our many projects friends became more and more familiar with the sewing machine. Providing them with the 'time' to work with the same piece of equipment for 2 months allowed them to become familiar and move from simply completing the project to actually wanting understand the "how" the machine worked.
Conversation progressed from "it looks like the machine is eating the material" as it moved forward, to "how" is that happening?
Although difficult to see, there are little moving pieces of metal that catch the material and keep it moving forward.