Where did the Monstrance of the Catholic churches get its design from?

During Eucharistic Adoration in Catholic churches, the consecrated host is kept in a [monstrance](https://en.wikipedia.org/wiki/Monstrance) on the altar for the faithful to venerate. The design of the monstrance is uniform across the world in that the round enclosure is surrounded 360 degree by sharp projections that look like flames. Or, do they represent the Crown of Thorns, or the rays of divine light? The Image of the [Sacred Heart of Jesus](https://en.wikipedia.org/wiki/Sacred_Heart) also has similar projections. My question is: **Where did the Monstrance of the Catholic churches get its design from?**