I haven't found much about You are not allowed to view links.
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At the top we can see the green of the leaves, but the outside has been painted an even golden brown. There are also somewhat regular circular marks under the paint, but I can't quite make them out.
The stem and roots are streaked with red, which in my opinion links it to the golden chalice that caught the blood of Christ after the crucifixion. Comparison image from Wroclaw, 1443.
This leaves the problem of the strangely curved blue petioles (?) around the flower (?). One might just say "it's round so it's a host, which was also present at the last supper" but I think it's something else. I realized this after seeing this image bi3mw posted earlier: You are not allowed to view links.
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The petioles form a "cloud" around the streaks and drops of red. The meaning seems clear: Holy Blood.
If the meaning of "blue=sky" is regularly employed, it might explain why such a disproportionate percentage of VM flowers (high on plant) are blue.