The Fairy Feller's Master-Stroke

Dadd painted it while incarcerated in the State Criminal Lunatic Asylum of Bethlem Royal Hospital, where he was confined after he murdered his father in 1843.

Dadd worked on the painting for nine years, paying microscopic attention to detail[2] and using a layering technique to produce 3D-like results.

Although it is generally regarded as his most important work, Dadd himself considered the painting to be unfinished (the background of the lower left corner is only sketched in).

[5] The end date, 1864, coincides with Dadd's transfer to Broadmoor Hospital in Berkshire, the asylum where he spent the remaining 21 years of his life.

[6] In order to give context to his work, Dadd subsequently wrote a long poem by the name of Elimination of a Picture & its Subject—called The Fellers' Master Stroke[2] in which each of the characters appearing in the picture is given a name and purpose—including myriad references to old English folklore and Shakespeare—in an apparent attempt to show that the painting's unique composition was not merely a product of random, wild inspiration.