This is the lovely letter I got from lovely Ilona. :)
There was this beautiful address label at the back side of the envelope, so to not to destroy it, I opened the envelope from the top with paper knife...
and destroyed this gorgeous inside pattern of the envelope!
As you see, I then finally opened the letter from three sides to see the pattern better.
This beautifully the pattern would have continued if I wouldn't have opened the envelope as I did.