From the BBC:
Mr Wigan, who has learning difficulties and cannot read or write, says that as a child he used his art to express himself.Links:
He told BBC News in 2005: "Being a child I used to start making houses for ants because I thought they needed somewhere to live.
"I lived in a fantasy world and I thought they needed shoes and hats."
BBC Article: Wigan's Lloyd's Tower
BBC Article: "sells for £11 million"
Willard Wigan Wiki