So when invigilating, you cannot mark or do anything that productively uses the time, so sometimes I choose a simple but repetitive fold that I can do without looking anywhere but in the direction of students being examined:

This is Michal Kosmulski’s “Oxi” module – an interesting variation of Tom Hull’s “Phiz” unit.

You connect them head to tail in pairs, then lock them together in threes, to make networked shapes. I have yet to explore the various configurations but it is an interesting unit I will return to when I have more time.