The Closed option connects the first and last curves; you cannot repeat curves in a loft. In this example, the curves in the first image are lofted. In the second image, the loft is not closed. The loft on the third image shows a closed loft.
The Closed option connects the first and last curves; you cannot repeat curves in a loft. In this example, the curves in the first image are lofted. In the second image, the loft is not closed. The loft on the third image shows a closed loft.