LT Christopher Wren London TransportOriginal vintage London Transport poster commemorating Sir Christopher Wren (1632 1723) featuring various images of the notable English architect, astronomer, mathematician and physicist with his signature, the text and London Underground roundel logo below Sir Christopher Wren was a Londoner, and London is fortunate that it was here that he achieved the bulk of his life's work. Wren was content that St. Paul's should be his memorial Si monumentum