Adoration of the Mystic Lamb (Dutch: 'Het Lam Gods' > The Lamb of God; completed 1432), by the brothers van Eyck is an all time masterpiece of art. And, I read, "Early Flemish polyptych panel painting". It is also source of never ending research/stories, as part of the panel was stolen in 1934. WHERE? Sint-Baafskathedraal, Gent, Belgium + .
Cave Painting Art Study, paint and chalk pastel on brown paper. Pictograph Lesson and additional petroglyph project with rocks. Check out how the teacher creates a cave out of the school hallway to display the projects. Neat.