the autumn sky
旻 centers on the autumn sky, evoking a clear, expansive, and slightly melancholic atmosphere.
旻 combines 日 (sun) and 文 (pattern, writing), but the exact historical development is uncertain. It may have originally depicted the patterned light of the autumn sky.
The sun 日 above a pattern 文 suggests the patterned light or textured appearance of the autumn sky.
For ビン, imagine a bin of autumn leaves under the clear sky: bin -> ビン, and the sky is reflected in the bin.