Wood or metal dividers between the panes of glass on a window. They can be purely decorative and architectural or provide real, structural support.
According to Wikipedia,
Below are some different types of mullion:
And a short video from Slow Home Studio discussing the use of mullion in interior design:
If you have questions regarding mullion or interior design, leave me a comment below, or email me at firstname.lastname@example.org.
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Have a wonderful day!