I found this in a nearby greenhouse and have not seen one like this before.
Any idea of a name? I forgot to look to see if it had a tag.
Unusal Begonia ?
This is why I found it so attractive the light was showing right through the leaves.
It looks like 'Cathedral'. There is a small version of it called 'Fiji Islands' too. These two have to be propagated by rhizomes to maintain the leaf variation. I've read that if you propagate them by leaf that they will revert to their parent ('erythrophylla'?).
Your beautiful begonia is called Cathedral windows! I have a few of these pretty begonias too!