One item struck me as most singular and evocative of Kubrick's wild attention to detail.
The archivist brought out a box containing a full ream of A4 paper on which was repeatedly typed "All work and no play makes Jack a dull boy" from the famous scene. Every page had a slightly different layout, mistakes and all, for 500 pages. Every single one typed by hand. We stood in awe at this grotesque achievement used to fill only a few seconds of film.
And then the archivist brought out the identical boxes for Italian, French, Spanish, German, all typed by hand with a different, locally chilling phrase for each.
My shock at this has almost outlasted my admiration.