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Length can be viewed as both real and illusory, depending on the perspective and context in which it is considered. On one hand, length is a measurable quantity that can be observed and quantified through physical means, such as using a ruler or measuring tape. In this sense, length can be considered a tangible and concrete aspect of our physical reality.
However, from a philosophical standpoint, length can also be seen as an abstract concept that is derived from the relationship between multiple objects and dimensions. For example, the length of an object is dependent on its position in space and its relationship to other objects, such as its width and height. In this sense, length can be seen as a relative and subjective concept, as it can vary depending on the observer and their perspective.
Ultimately, whether length is real or illusory may be a matter of interpretation and perspective. It can be argued that both views hold validity, as length exists as a tangible aspect of our physical reality while also being a product of our perception and understanding of the world around us.