One day, Sherlock Holmes and Doctor Watson were doing their usual investigative business, when they uncovered an unusual painting.
At first glance, it looked like a picture of normal oak tree, in the middle of a wilderness, but if one looked closer, one could see that it was a remarkable painting. The tree trunk was actually made of fire, and its branches were made of ice, clouds and earth.
"What is it, Holmes?" asked Watson in awe.
"It's an Element tree, my dear Watson," replied Holmes.