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The Gemora states that a moving courtyard cannot effect an acquisition for its owner. The Rishonim disagree as to the reason for this. Rashi and Tosfos maintain that since the halacha that a courtyard can effect an acquisition for its owner is derived from the halacha of acquiring through one’s hand, a moving courtyard, which does not resemble to a hand (which is stationary), cannot effect an acquisition for its owner.

The Ritva and the Ran suggest a different reason for this. They say that since the courtyard can be a great distance away from the owner, it is not considered protected by the owner, and therefore it is disqualified from effecting an acquisition for the owner.

The Divrei Mishpat notes that the following case would be a difference between them: If a lost object would fall on his animal which is in his courtyard. If a mobile courtyard is excluded because it does not resemble a person’s physical hand, he will not acquire this lost object, for the animal is a moveable object. If, however, a mobile courtyard is disqualified from effecting an acquisition because it is not guarded from intrusion by the owner, here, he will acquire the lost object because the object is protected.