Chekhov's gravestone

[Giampaolo Gandolfo]

    On a recent visit to the Novodevicij  Churchyard in Moscow, I noticed for the first time that on Chekhov's gravestone (designed by Schechtel, if I remember correctly) there are four hollow spots (in the form of a square, right below) that had never catched my attention before.
    They are carefully carved and are evidently part of the artistic project of the tombstone, but what is the meaning? I haven't found any reference to that detail in all the Cekhov literature that i have so far been able to check.
    Any idea?
                Giampaolo Gandolfo

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