it won't be very comfortable , one cannot sleep or sit in this kind of chair for long , you can't stretch your legs and your back also will take much load due to curvy base of chair. but if you want , you can consult an experienced carpenter , he can make this with flexible ply. not a tough task.
As Mr Raghu has commented, designer pieces (in whatever category) are not for ergonomics or practicality for normal use. This one is a famous design by a group of professors at the Victoria University of Wellington, New Zealand to aid Autism.
You will have to order a piece from New Zealand to be true to its purpose. Copying can be done by a skilled carpenter in India, no doubt, but would still be expensive and a fake.
Expert from Inhabitat website:
Cradle is a sustainable rocking chair created by a collaborative effort to aid people with autism and Rhythmic Movement Disorder (RMD). Developed within the Victoria University of Wellington, this cocoon-like seat is made from cold-bent plywood. Because rocking is one of the calming activities that is recommended for autistic folks, this special seat is a soothing and aesthetically pleasing addition to their homes.
Cornerstone Design Studio India
Raghu Nandan Reddy Oggu
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