Saw this at the Bodies Exhibit. Blood vessels are injected with a formula that hardens them like plaster, then they literally soak the organ in acid so everything is eaten away except for the vessels. What's left is amazing!
"Cells" - As geometry connotes order, organic shapes represent freedom. As echoes of organic shapes found in nature, organic shapes in art present elements of movement, growth, evolution, surprise, elegance, and unexpected beauty.