Levels: 5 Fast Facts

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Fact #1. Whether you're a carpenter, an interior decorator, or an installation artist, if you want to get things straight, you need to use a level. These humble, handy devices use the basic physical attributes of gravity and buoyancy to help you identify angles quickly and accurately.
Fact #2. Early leveling devices were used to help builders erect everything from the pyramids at Giza to the Parthenon to the Coliseum and beyond. The first known version approximating the modern design wasn't invented until sometime in the mid 17th Century. That was the time in which the letters of a French inventor, scientist, cartographer, and author first make mention of his new device, an early but functional bubble unit.
Fact #3. The proper name of this device is spirit level. This name comes from the fact that the liquid within the vial is usually an alcohol such as ethanol or some other similar spirit. A spirit has a wider temperature range as a liquid than does water. Thus, it's less susceptible to the expansion issues potentially caused by water as it freezes.
Fact #4. For work in the construction field, there's no option except for precision. Safety and the longevity of a building or home absolutely depend on it. Most people in the professional builder's world will have at least the occasional need for these devices. While a plumber or an electrician may get away with only occasional usage, other workers will use one almost every hour of every day of the work week.
Fact #5. Chances are that you can manage to hang a single framed picture in your house and get it looking parallel to the ground without use of one of these. However, if you're hanging multiple photos or paintings in line with each other, then the eye will clearly be able to determine which are off level by contrasting the various frames. Hanging multiple pictures precisely, therefore, calls for a level.