How was it invented?

I am an occupational therapist and i worked with a customer called Sylvi. She is a passioned handicrafter, but due to a stroke, her left side is paralyzed. Sylvi and her husband Jussi invented this shape to make it possible for Sylvi to continue her beloved hobby, without constantly needing to ask Jussi to assist her. We continued to develop the product together and used it in therapy. Sylvi and Jussi are older of ge, so i decided to make this a product and help people to gain joy in their life by doing handicrafts!