The "Fabian Window", was made by Charlotte in 1910 to a design by George Bernard Shaw. The window shows Edward Pease, Sidney Webb and other members of the Fabian Society helping to build 'the new world'. It is thought to have remained in Caroline's studio until after her death in 1944.

The Fabian Society is a British socialist organisation whose purpose is to advance the principles of social democracy and democratic socialism via gradualist and reformist effort in democracies, rather than by revolutionary overthrow.

This strategy derives its name from Quintus Fabius Maximus Verrucosus, the dictator of the Roman Republic given the task of defeating the great Carthaginian general Hannibal in southern Italy during the Second Punic War (218–201 BC).

After reading a tract, Why Are The Many Poor?, issued by the recently formed Fabian Society, Shaw went to the society's next advertised meeting, on 16 May 1884. He became a member in September, and before the year's end had provided the society with its first manifesto, published as Fabian Tract No. 2.