
I developed it from a project called 'lightband' for which there are free resources for on youtube and also at www.nelc.net under their 'not a desk tidy' directory of resources
Am supporting teachers trying this over the next couple of weeks with classes. It uses felt for the main material, two layers with a neodymium 10mm magnet and washer fixed between the layers. Simple, effective and capable of infinite variations by students and staff...