וְגַ֨בֵּיהֶ֔ן וְגֹ֥בַהּ לָהֶ֖ם וְיִרְאָ֣ה לָהֶ֑ם וְגַבֹּתָ֗ם מְלֵאֹ֥ת עֵינַ֛יִם סָבִ֖יב לְאַרְבַּעְתָּֽן׃
As for their rings, they were high and they were dreadful; and they four had their rings full of eyes round about.
Read kabbalistic (mystical) interpretation of Ezekiel 1:18: and classical mystical sources.