“What we’ve got here is failure to communicate.”
Sometimes aliens are so alien, nothing works. You just never break through.
Solaris, Stanisław Lem. Wikipedia. Apparently this planet is covered with a sentient being. It does stuff, like create a copy of a person. But what does it all mean? Decades of books contain observations, nothing more.
“Spar”, Kij Johnson. Text. She shares a tiny spaceship with an alien. From her point of view, they have s*x, a lot. She has no idea how the alien experiences this. She’s probably close to losing her mind.
“The Dance of the Changer and the Three”, Terry Carr. Text. This very interesting planet is inhabited by energy beings. In 4 years communication hasn’t become perfect. And that’s inconvenient, when they do something inexplicable and dangerous.