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 Is there really a euro note that has those stained glass windows? Or is that wise rabbit's art? Good touch is the latter ; perfect example of inversion of meaning and value if the former. 
 Yes, the top one is a real 20 EUR note. 

The 21 BTC note has some bridge design on the back. 
 Yes, this is the last version of euro bill: https://image.nostr.build/37195d3c6349a1ddc1b03f75a5e6c3c77e0c113974e4aa6a71d87cacf3475c07.jpg
The new ones have also a transparent window with a portrait of Europa (consort of Zeus) https://image.nostr.build/2275868b501b5379cef61e34b69b6b140bee1c775aed1ebb9e01e8f16a55215f.jpg