By Leslie Umberger and Jill Vaum Rothschild Andrew Clemens, Untitled (The Mary Heye Bottle), 1883, naturally colored rock sand in pharmacy bottle, sealed with wax, Smithsonian American Art Museum ...

Rock Art Research, 2024 In 2018 ... Now, researchers say the rock could be a sand sculpture created to look like a blue stingray (Dasyatis chrysonata), which are often found in southern Africa.