Responsa for Shabbat 201:3

מתקיף לה רב נחמן ולימא גוד אחית מחיצתא מי לא תניא ר' יוסי בר' יהודה אומר נעץ קנה ברה"ר ובראשו טרסקל וזרק ונח על גביו חייב אלמא אמרינן גוד אחית מחיצתא ה"נ נימא גוד אחית מחיצתא

we have no objection.<span class="x" onmousemove="('comment',' Providing in both cases that they are ten high above the level which gives the breadth of four. ');">⁶</span> R. Nahman demurred to this: But let us say, Stretch and bring the partitions down.<span class="x" onmousemove="('comment',' I.e., adopt the legal fiction that the sides of the boat drop vertically down to the water, which gives the necessary breadth to make it rank as private ground. ');">⁷</span> Was it not taught, R. Jose son of R. Judah said: If one plants a rod in the street, at the top of which is a basket, and throws [an article] and it comes to rest upon it, he is liable: this proves that we say. Stretch and bring the partitions down,<span class="x" onmousemove="('comment',' For only if we assume imaginary partitions descending from the sides of the basket, which is not ten handbreadths deep itself have we the necessary conditions for culpability. ');">⁸</span>

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