
And while perusing just one letter between two people provides hints into their relationship, digging into a whole trove of letters sent over the course of several years can reveal intricacies that face-to-face interaction with the authors never would. There is no performance, no act put on for third-party observers. The personalized salutation, the handwriting quirks, and the inside jokes sprinkled throughout offer a glimpse at an interior world only the recipient is meant to see.

Reading someone else’s private letters feels almost as intrusive as spying on them through their living-room window.
