Here are links to a few videos that show you what a Reknrek is, how and why  we use it in class. There are lots more if you continue with the links.

https://www.youtube.com/watch?v=MiYgE_NWB60

https://www.youtube.com/watch?v=ddn5Yrbezss

https://www.youtube.com/watch?v=HgluhL1dVMU

Want to make one for home? https://www.youtube.com/watch?v=t7nYTFynWhA