a Tree 

"a Tree" is a bold and expressive painting by German Expressionist artist Otto Mueller. This work, currently housed in the Čiurlionis National Art Museum in Kaunas, Lithuania, displays Mueller's signature style, using thick brushstrokes and vibrant colors to depict the dynamic energy of the natural world. The tree's branches are rendered with intense, gestural lines, creating a sense of movement and a powerful visual impact. The use of contrasting colors - earthy browns and greens against the bright blues and yellows - further amplifies the artwork's dynamism and the tree's inherent vitality.