Oh, my, then what do you see then? The spelling of barcarolle has two ll's on the cover, and the correct spelling of barcarole is with one L.
I thought that's what you my have been thinking. I checked several editions of this piece and found both spellings.
Nope, Barcarolle is spelled correctly. My guess is that it has something to do with the pianist herself.
Now you're onto something...
Really? Interesting....indeed about the cover. The mystery intrigues me.
OK, I'll give another hint. In art there is a term called the 'vanishing point' that parallel lines will appear to converge to a point in the distance.
If the artist does not obey this rule, the painting or drawing (assuming it to be real life and not abstract) will look odd.
Although this is a photograph, one would expect to see this effect to some extent.
Of course, I have made some assumptions here as well.