Commentary for Eruvin 156:17

אמר אביי לענין מחיצה כולי עלמא לא פליגי דהויא מחיצה אבל לענין חציצה אי בטלי' חייץ ואי לא בטלי' לא חייץ:

MAY BE PREPARED, BUT NOT ONE. <big><b>GEMARA: </b></big>But does not straw constitute a proper filling seeing that we have learnt: If a heap of straw between two courtyards was ten handbreadths high two 'erubs may be prepared<span class="x" onmousemove="('comment',' One for each courtyard.');">⁵⁶</span> but not one?<span class="x" onmousemove="('comment',' Infra 79a; which proves that straw, though not intended to remain permanently in its position, constitutes nevertheless a valid partition. Why then does it not equally constitute a valid filling?');">⁵⁷</span> - Abaye replied: As regards the formation of a partition no one disputes the ruling that straw is regarded as a valid partition;<span class="x" onmousemove="('comment',' So long as it remains in its place; as is the case with other movable objects which (cf. supra 15b) constitute a valid partition.');">⁵⁸</span>

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