Made out of paper, a flexagon can be folded into itself for what seems like an infinite loop, but is actually just 4 repeating frames. Combined with colors and storytelling, they can be a great way to explore different subjects through paper engineering.
Included with the instructions are 3 templates to use along with classroom activity inspiration.
Pop-ups are an endlessly fascinating way to explore geometry in motion.
This page contains activities on ways to create and observe what is happening with one particular mechanism in paper engineering, the V-fold.