It must be a Hellenized synagogue because images are forbidden in Judaism.
The Huqoq excavations revealed the first nonbiblical mosaic found in an ancient synagogue. That three-tiered mosaic included a scene showing a meeting between two important male figures, thought to be the legendary meeting between Alexander the Great and the Jewish high priest.
The general reading of the bible prohibition is that it applies to producing “graven images” for the purpose of worshiping them, but not for other purposes.
Except for the cherubim on the Ark of the Covenant, right?
Exodus 25:18-20
And make two cherubim out of hammered gold at the ends of the cover. Make one cherub on one end and the second cherub on the other; make the cherubim of one piece with the cover, at the two ends. The cherubim are to have their wings spread upward, overshadowing the cover with them. The cherubim are to face each other, looking toward the cover.
Or the snake that healed those bitten by poisonous snakes.
Numbers 21:8-9
The LORD said to Moses, “Make a snake and put it up on a pole; anyone who is bitten can look at it and live.” So Moses made a bronze snake and put it up on a pole. Then when anyone was bitten by a snake and looked at the bronze snake, they lived.