וַיַּ֕עַשׂ חֲמִשִּׁ֖ים קַרְסֵ֣י זָהָ֑ב וַיְחַבֵּ֨ר אֶת־הַיְרִעֹ֜ת אַחַ֤ת אֶל־אַחַת֙ בַּקְּרָסִ֔ים וַֽיְהִ֥י הַמִּשְׁכָּ֖ן אֶחָֽד׃ (ס)
And he made fifty clasps of gold, and coupled the curtains one to another with the clasps; so the tabernacle was one.
Read kabbalistic (mystical) interpretation of Exodus 36:13: and classical mystical sources.