Here's a screenshot of the trade agreement. It's a straight one-for-one trade of Great Works of Writing. I'm playing on Standard, with no expansions. I'm confused as to what the AI expects to gain from this trade.
Mine was created in 50AD and his was created in 1350 AD, but both provide 4 Culture 4 Tourism - are older ones worth more in some other intangible way? Is this something where he wants some kind of cultural diversity among his Great Works? Is this some weird thing Ghandi specifically likes to do?