London Underground Poster Museum Of Childhood Bethnal Green Squirrel. Original vintage London Underground poster for The Museum of Childhood nearest station Bethnal Green. Great design depicting a view through a black background of a girl holding a spoon above a cup on a table with a squirrel holding a nut and a window open on the side. Childhood by Simon Gales a new work of art commissioned by London Underground. Art on the Underground. Excellent condition. Country of issue: UK, designer: Simon Gales, size (cm): 152x102, year of printing: 1990.