You can easily tell the difference between 1 and 2 pounds,but not 200 and 201 pounds,illustrating Weber's Law.

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Weber's law states that the difference threshold is proportional to the magnitude of the stimulus. In other words, the smallest noticeable difference between two stimuli (known as the just noticeable difference or JND) increases as the stimulus magnitude increases. Therefore, it is easier to distinguish between 1 and 2 pounds because the difference represents a relatively large percentage change, but it is harder to distinguish between 200 and 201 pounds because the difference represents a relatively small percentage change.

You Can Easily Tell the Difference Between 1 and 2