In the smithy

'In the Smithy' (1899) shows Lentz moving decisively into the territory of industrial labour that was reshaping Polish urban life at the century's turn. Warsaw's rapid industrialisation in the 1880s and 1890s had created a substantial working class employed in metalworking, textiles, and manufacturing, and the smithy — an ancient craft elevated by the new industrial economy — was a charged subject. The forge interior, with its dramatic chiaroscuro of flame and shadow, had long attracted painters: from Velázquez's Forge of Vulcan to Joseph Wright of Derby's Iron Forge, the smithy's visual drama was established. Lentz brought his realist naturalism to bear on Warsaw's industrial moment, painting workers in their actual environment rather than as allegorical types. The 1899 date places the work a decade after the great industrialisation push and six years before the 1905 revolution, when labour tension would become explosive. The painting aligns with Lentz's broader engagement with social subjects — alongside 'Strike' — that distinguish him from painters content with portrait commissions alone.

Forge interiors demand mastery of artificial light: the intense, localised glow of a furnace throwing warm orange light onto figures while the surrounding space remains in deep shadow. Lentz would have constructed this composition through careful tonal mapping, using the forge light as both pictorial drama and social metaphor for the illumination of labour.