A Poorly Designed Object
Water faucets with two handles, one that changes the controls the hot water and one that controls the cold water are difficult to use. It is hard to control the temperature of the water because there is no way of knowing how how far you have turned the handle corresponds to the temperature and pressure of the water. There is no immediate feedback to tell you the temperature of the water because it changes as it flows longer, so you are often left waiting for the water to heat up, and wasting water in the meantime. But then the water will quickly get too hot. I often try to turn on both the cold and warm handles to obtain a moderate temperature of water, but then if I have both handles on I get confused about which handle I need to turn to stop the water. This is especially confusing if the handles turn 360 degrees and I cannot remember which way to turn them to turn it off. One single handle that controls both the cool water and the hot water is much more intuitive because there is a visual representation of what the temperature of the water is based on how far the handle is turned.
Water faucets with two handles, one that changes the controls the hot water and one that controls the cold water are difficult to use. It is hard to control the temperature of the water because there is no way of knowing how how far you have turned the handle corresponds to the temperature and pressure of the water. There is no immediate feedback to tell you the temperature of the water because it changes as it flows longer, so you are often left waiting for the water to heat up, and wasting water in the meantime. But then the water will quickly get too hot. I often try to turn on both the cold and warm handles to obtain a moderate temperature of water, but then if I have both handles on I get confused about which handle I need to turn to stop the water. This is especially confusing if the handles turn 360 degrees and I cannot remember which way to turn them to turn it off. One single handle that controls both the cool water and the hot water is much more intuitive because there is a visual representation of what the temperature of the water is based on how far the handle is turned.
Scissors are example of a generally well designed everyday object. Usually one end is plastic to differentiate it from the sharp end used for cutting things. The plastic ends have holes that indicate that you should put your fingers to grip the scissors, and they can only move apart in one way. The way that you move scissors corresponds directly with how you cut something, like a piece of paper or fabric. Furthermore, when you hold scissors with the right end, it is most natural to hold them so that the blade points away from you and you are at less of a risk of cutting yourself. When you are not using the scissors the blades are together and are meant to stay together so that they will not accidentally cut you.
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