We have been learning that if a found item has a distinguishing mark, we need to try to return it. Today’s daf deals largely with items that have no distinguishing mark, but have been left in a purposeful pattern by which they might be identifies.
Rabbi Yirmeya raises a dilemma: If one found coins configured like a round bracelet, what is the halakha? If they were configured like a straight line, what is the halakha? If they were configured like a triangle, what is the halakha? If they were configured like a ladder, one partially upon the other and partially protruding, what is the halakha? The Gemara suggests: Resolve at least one of these dilemmas, as Rav Naḥman says that Rabba bar Avuh says: For any arrangement of coins such that if one were to introduce a wood chip between the coins he could thereby lift them all at once with that wood chip, he is obligated to proclaim his find.
So, if they are in a shape that can be lifted (great visual here), they are considered to have a distinguishing mark. Now we get a real twist:
Rav Ashi raises a dilemma: If they were configured like the stones of the house of worship dedicated to the Roman deity Mercury, what is the halakha? The Gemara suggests: Come and hear a resolution of the dilemma. As it is taught in a baraita: If one found scattered coins, these belong to him. If they were configured like the stones of the house of worship dedicated to Mercury, he is obligated to proclaim his find. The Gemara explains: And these are coins that were configured like the stones of the house of worship dedicated to Mercury: One was situated here on one side, and one was situated there alongside it, and one was situated atop the two of them.
What!? The house of Mercury? Is this not Pegan worship? Oh, yes it is. Apparently, Mercury is the god of merchants (like Hermes) and the rabbis hated him and considered him as idolatrous (because, worshipping him would be idolatrous). However, we learn from here that a standard bricklaying scheme is what it would look like to build a house to him, and so they too marked coins as not accidentally dropped, but placed there by someone who might want to pick them back up.

