you say "no need for it to be discussed in the brief summary given within the Leonardo da Vinci article" No need why. Says who? I am proof enough a simple summary why should be included. Stangely enough all the major news networks here on Mars haven't covered the controversy of the painting. Nor on Earth. At least not front page on the major news outlets be it BBC, Reuters, Fox, CNN etc. Rather than sarcasm why not add the information that way the caption actually has context to the article rather than be misleading and non linking for those who want to know why. Then you say "but it is something that people find interesting" whats interesting about a statement that doesn't say why? Hey this painting is controversial but here on the authors page we won't say why or link it we will just leave it up to you to dig. Not very helpful is it. So why not just best of both worlds if you know the reason why its 'controversial' add the info or link it somehow so those of us living on Mars know why. Rather than just being presumptuous   and assuming everyone knows because you do.