Seen a large metallic object, multiple flat-sides, tall as it was wide, stationary in the clouds far below my plane over Greenland, some years ago.
Was man/? made, was not a natural object.
Have no idea what it was, who made it, or why it was there. When you visibly see something like that, once past the initial "wtf", you dont give it much thought, as there are zero questions you can ask yourself, that you will have an answer. You see it, you are like Fack, and then you forget it.