- Plucking (Wikipedia)
Plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the weathering and erosion of pieces of bedrock, especially large “joint blocks”. This occurs in a type of glacier called a “valley glacier”. As a glacier moves down a valley, friction causes the basal ice of the glacier to melt and infiltrate joints (cracks) in the bedrock. The freezing and thawing action of the ice enlarges, widens, or causes further cracks in the bedrock as it changes volume across the ice/water phase transition (a form of hydraulic wedging), gradually loosening the rock between the joints. This produces large pieces of rock called joint blocks. Eventually these joint blocks come loose and become trapped in the glacier.
- Through a Glass Lushly: Michalina Janoszanka’s Reverse Paintings (ca. 1920s) (publicdomainreview.org)
Michalina Janoszanka (1889–1952) is an artist better known for her role on the other side of the canvas, as the muse and mentee of famed Polish painter Jacek Malczewski (1854–1929). She posed for countless symbolist paintings, appearing alone, alongside Malczewski in double-portraits, among satyrs, and as Medusa. However, Janoszanka was more than a muse. She was also an artist in her own right. Trained in Kraków and Vienna, she became a strong oil painter. Her themes were traditional: portraits, still lifes, and religious scenes. But what most captured her mentor’s excitement, not to mention the attention of the Young Poland modernist art movement, was something else: the surreal, kaleidoscopic landscapes she painted directly onto glass.