Commentary for Eruvin 18:6

he reported in the name of R'Johanan [that a post that may be] seen from without but appears even from within cannot be regarded as a valid side-post. It was stated: [A post that] is seen from within but appears even from without<span class="x" onmousemove="('comment',' I.e., the outer edge of the post is even with the outer edge of the wall of the alley so that to those viewing it from without, the post appears to form a part of the thickness of the wall, while by those within, the thickness of the inner edge that protrudes from the wall can well be seen.');">¹⁵</span> is regarded as a valid side-post; but if it is seen from without and appears even from within<span class="x" onmousemove="('comment',' Where the inner edge of the post touches the outer edge of the wall, and the inner width of the post is even with the interior side of the wall, but receding from its outer side.');">¹⁶</span>

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