Atika is present in three - in two it is one
Rabbi Shimon tells us about the head that is high above the three heads of Arich Anpin. He says that Atika Kadisha is both the supernal Keter of all higher beings and also the head above it, the entirely unknown head. It is one, and everything is one.
42. This Atika, NAMELY ARICH ANPIN, is present in three heads included inside one head, AS TOGETHER THEY ARE ONE HEAD OF ARICH ANPIN, and that one higher head, NAMELY THE UNKNOWN HEAD, THE HEAD OF ATIKA, is high up, NAMELY, ABOVE THE THREE HEADS OF ARICH ANPIN. And since Atika Kadisha manifests in three HEADS, THE SECRET OF THE THREE COLUMNS, so do all the candles, NAMELY SFIROT, that radiate from it manifest in three. Moreover Atika Kadisha manifests in two, because Atik in all is in two: 1) it is the supernal Keter of all higher beings, the head of all heads; 2) and also that HEAD above it, NAMELY the unknown HEAD. So do all the candles manifest in two. Furthermore, Atika Kadisha both manifests and is hidden in one, THAT IS, ALL THE LIGHTS WITHIN IT ARE INCLUDED IN THE REIGN OF THE LIGHT OF CHASSADIM ALONE. It is one and everything is one. So are all the other candles sanctified and connected and revert to one, and are one.
42. הַאי עַתִּיקָא אִשְׁתְּכַח בִּתְלַת רֵישִׁין, וּכְלִילָן בְּחַד רֵישָׁא. וְהַהוּא רֵישָׁא עִלָּאָה, לְעֵילָּא לְעֵילָּא. וּבְגִין דְּעַתִּיקָא קַדִּישָׁא אִתְרְשִׁים בִּתְלַת, אוֹף הָכִי כָּל שְׁאַר בּוּצִינִין דְּנַהֲרִין מִנֵּיהּ, כְּלִילָן בִּתְלַת. עוֹד, עַתִּיקָא אִתְרְשִׁים בִּתְרֵין. כְּלָלָא דְּעַתִּיקָא בִּתְרֵין. הוּא כִּתְרָא עִלָּאָה דְּכָל עִלָּאִין, רֵישָׁא דְּכָל רֵישֵׁי. וְהַהוּא דַּהֲוֵי לְעֵילָּא מִן דָּא, דְּלָא אִתְיְדַע. כַּךְ כָּל שְׁאַר בּוּצִינִין, סְתִימִין בִּתְרֵין. עוֹד עַתִּיקָא קַדִּישָׁא אִתְרְשִׁים וְאַסְתִּים בְּחַד, וְהוּא חַד, וְכֺלָּא הוּא חַד. כַּךְ כָּל שְׁאַר בּוּצִינִין, מִתְקַדְּשִׁין, מִתְקַשְּׁרִין, וּמִתְהַדְּרִין בְּחַד, וְאִינּוּן חַד.