It has been pointed out that Lorentzcontraction is not a kind of visual effect but a measurement effect.
某些文献已经指出，洛仑兹收缩不是一种观察效应，而是一种测量效应。
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If the absolute reference frame is admitted, in accordance with FitzGerald-Lorentz length contraction effect and Lodge-Lorentz time dilation effect, the slide down paradox can be eliminated.
By using Lorentz transformation, this article explains the paradox of Lorentz length contraction, it also proves that observers in different reference systems reach the same observing conclusion.