A scrim will appear entirely opaque if everything behind it is unlit and the scrim itself is grazed by light from the sides or from above. A scrim will appear nearly transparent if a scene behind it is lit, but there is no light on the scrim. A dreamy or foggy look can be achieved by lighting a scene entirely behind a scrim.
Food or small objects can cause choking if they get caught in your throat and block your airway. This keeps oxygen from getting to your lungs and brain. If your brain goes without oxygen for more than four minutes, you could have brain damage or die. Read more on MedlinePlus.gov.
Choking is caused when a piece of food or other object gets stuck in the upper airway. In the back of the mouth are two openings. One is the esophagus, which leads to the stomach; food goes down this pathway. The other is the trachea, which is the opening air must pass through to get to the lungs. When swallowing occurs, the trachea is covered by a flap called the epiglottis, which prevents food from entering the lungs. The trachea splits into the left and right main stem bronchae. These lead to the left and right lungs.