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In page Whistler's Mother:

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The sensibilities of a Victorian era viewing audience would not accept what was a portrait exhibited as an "arrangement", hence the addition of the explanatory title Portrait of the Painter's mother. From this, the work acquired its enduring nickname of simply Whistler's Mother. After Thomas Carlyle viewed the painting, he agreed to sit for a similar composition, this one titled Arrangement in Grey and Black, No. 2. Thus the previous painting became, by default,[citation needed] Arrangement in Grey and Black, No. 1.