[Character reader and clairvoyant in a British travelling show of the 1940s, collected by Arthur James Fenwick (1878–1957)](By Tyne & Wear Archives & Museums - Flickr: Character reader and Clairvoyant, No restrictions, Link)
Why clairvoyants do not exist. The answer is very simple. Because they are trying to prove their abilities. They need to use them, not prove them. This is their main mistake. Although this is not a mistake, it is a method of deception. That's why very strange people look who even presume the existence of such a fact.
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From @botinki