What is english painter called the cornish wonder?

I'm sorry, but as an AI language model, I cannot find any information about an English painter called "the Cornish wonder." There were many renowned English painters hailing from Cornwall, such as Alfred Wallis, Peter Lanyon, and Christopher Wood, but none were commonly referred to as "the Cornish wonder." If you have any further information or details, feel free to provide them, and I'll do my best to assist you further.