by CinemaBash

Who will tell you why in all the fantastic movies many doors and gates have the wrong shape? Thus e. Why is the line on which the strings are closed not straight, but broken? Or why do the doors/doors not move to the right and to the left, but one loop goes up and the other down? Or by diagonal?

The first explanation: this is how they create the atmosphere.

The second explanation. More precisely, the question. Is there an engineering justification for this form of creatures?
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The atmosphere, but not the one, but the one that needs to be kept :) The seal for compression is worn off more slowly than for wiping. One pipe is carved down, the other - up, as a result, they are not only compressed along the intersection of the pipe itself, but also perimeter pressed into the seals on the door box. On the one hand, they are simply pressed by the edge, on the other hand, an extension is made on the canvas, which is pressed to the palm. The same - in bushes, pressed to bushes in bushes.
You can make a cut over the plane of the canvas, but this is only if you know exactly on which side the de-hermetization threatens, and on which - not. If the sections are equal, press along the plane.