I did the spot paintings to solve formal problems with colour. (royalacademy.org.uk)
Bircken's consistency to work through and continuously develop formal problems can be traced throughout her past solo exhibitions at the Stedelijk Museum CS in Amsterdam and at the Ursula Blickle Stiftung in Kraichtal (both in 2008). (vernissage.tv)
Although his vessels are undoubtedly decorative, Salto was a trained painter fixated on formal problems — how does the thickness and sheen of a glaze change as it slides over bumps and into grooves? (andrearosengallery.com)