הֶ֣בֶל הֵ֔מָּה מַעֲשֵׂ֖ה תַּעְתֻּעִ֑ים בְּעֵ֥ת פְּקֻדָּתָ֖ם יֹאבֵֽדוּ׃
They are vanity, a work of delusion; In the time of their visitation they shall perish.
Read kabbalistic (mystical) interpretation of Jeremiah 10:15: and classical mystical sources.