The sculpture that Miranda is referring to is by Shinichi Sawada and can be seen here. and below. This was exhibited in the Souzou Outsider Art from Japan exhibition at the Welcome Collection 28 March – 30 June 2013
Below is a short video showcasing some of the art from that exhibition.
The sculpture that inspired Miranda
If you are interested in learning more about outsider art the BBC Imagine series did a documentary called “Turning the Art World Inside Out”, which I think includes Shinichi Sawada.