Pulmonary embolism is the sudden blockage of a major blood vessel (artery) in the lung, usually by a blood clot . In most cases, the clots are small and are not deadly, but they can damage the lung. But if the clot is large and stops blood flow to the lung, it can be deadly.
The term chiaroscuro (from the Italian words chiaro, meaning light, and scuro, meaning dark) refers to the use of light and shade in a work of art to define three-dimensional objects. Masters of this technique were the Italians Leonardo da Vinci and Caravaggio and the Dutch painter Rembrandt.
Like the cinematographers of classic Hollywood, they used the play of light and shadow to give life and drama to their images. The word chiaroscuro is Italian for light and shadow. It's one of the classic techniques used in the works of artists like Rembrandt, da Vinci, and Caravaggio.