Take five: curiosities about andrea della robbia

From Raphael and the mysterious Fornarina to Jan Steen with his flirtatious Margriet and Suzanne Valadon, who broke many hearts until she lost hers to a much younger man, Nick Trend explores five romances that made art history

The piece I’d never part with

Exhibition of the week Andy Goldsworthy: Fifty Years ...

At his studio fringed by the mountains of Klosters, Swiss sculptor Christian Bolt is feverishly cooking up recipes to re-create terra secca , a material used in Renaissance Italy, not only to expand his own artistic horizons, but to help save the planet

So close was Jean-François Millet to the humble peasants he painted that he wore clogs and coarse clothing. He was steeped in nostalgia, yet inspired avant-garde artists from van Gogh to Salvador Dalí, finds Mary Miers

The Yellow Boy by Joshua Reynolds saw multiple peregrinations, passing even through (Romanian) royal hands for a time, before returning to London in 1981. It now headlines a selling exhibition of magnificent 18th to 20th-century works