I am not totally sure but i think the light pattern created is called a “bokeh”? I’ll let someone much more knowledgable on the topic than me explain!
Here’s the link to the tutorial…
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Mila Craven
Mila Craven is the maker behind DIY Crafts Guru. She specializes in budget-friendly seasonal decor and believes every project on this site should be doable on a weeknight with supplies under $20. Every tutorial is one she's actually made — including the failed batches she warns you about.
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