Dear Mr Cornwell, First of all let me start by thanking you for all your works so far, I have been reading your books since I was 14 years old and enjoyed every one! The ones I have got the most enjoyment and inspiration from are without doubt the Arthur books, and it is these I have a question about. Can you kindly provide any information or further reading on the dream tower, as used by Merlin until it was burnt down? Did these really exist? I find it a very interesting concept, and would like to find out more and maybe try building one! Thank you very much, and I hope you continue to bring pleasure to countless people through your work for many years to come. Yours, Joe