Given the task definition and input, reply with output. You are given a passage. You need to construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) its answer is the whole paragraph. Avoid creating questions that can be answered correctly without actually understanding the paragraph.

The custom of placing stones on a grave or gravestone may hearken back to the biblical custom of erecting a pile of stones over a grave as a marker. It may also reflect the importance of visitation to the grave, with the stone indicating that someone has been to visit.

Rabbi David Wolpe suggests that in ancient times, a shepard counted his sheep at the beginning of the day by carrying the corresponding number of stones, and these were used to ascertain that the same number returned at night. Rabbi Wolpe then suggests that thestones may symbolize how precious each soul is to God, who, as it were, 'counts" each person in the world.

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what is the jewish custom of putting rocks on a graveto show love and care for the deceased?