Reference for Bava Batra 38:10

מיתיבי קופה מלאה תבן וחבית מלאה גרוגרות המונחים בחלון רואין כל שאילו ינטלו ויכולין תבן וגרוגרות לעמוד בפני עצמן חוצצין ואם לאו אין חוצצין והא תבן חזי לבהמתו

I might think that he does ignore its existence. Therefore R. Tobi tells us [that even a thin cake does not narrow the window space]. Cannot this be derived from the fact that a wafer is a thing which is capable of becoming [ritually] unclean, and the rule is that anything which is capable of becoming ritually unclean cannot form a partition to prevent the passage of uncleanness?<span class="x" onmousemove="('comment',' Hence there would appear to be no point in stating the rule. ');">⁸</span>

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