A bismuth hopper crystal is a crystal with a staircase-like shape that forms when bismuth atoms attach to the edges of a rapidly growing crystal. This process is called "hoppering", and it's caused by electrical attraction that's stronger along the edges of the crystal. The result is that the edges of the crystal grow faster than the center, creating a hopper-like shape (a hopper being a container that tapers downward.) | Rare Earth Gallery

🌊 Boy, boy, what a buoy... 🎶 Edward Hopper’s "Ground Swell" (1939) looks like a peaceful day on the water, but there’s a weird tension lurking beneath the surface. The rising swell, that dark buoy...something feels off. Painted just before World War II, could this be a calm before the storm? 🖼️ Ground Swell, 1939 👨🏻‍🎨 Edward Hopper 📐 36 × 50 in, oil on canvas, Corcoran Collection 📍National Gallery of Art, Washington D.C. Other painting in the video: Edward Hopper, “Self-Portrait,” 1925–3