Mourning
Under the cross is a mouth and another mouth wearing special clothes because they're in mourning.
Picture the cross looming overhead, people's mouths open so they can sob loudly, and everyone wearing the same color clothes (just picture whatever color works for your particular culture/religion combo).
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As the mourning continues, the soul (そう) of the dead person rises out of the cross. The soul looks around at all of the mourners and nods. Yes, your mourning has pleased it.
If you aren't mourning enough, when the soul comes out of the person's body, it will get really mad. "What, I'm not worth a few tears? Really?" And then the soul will haunt you. So you better mourn like you mean it.