unaided eye

Though just able to reach to the threshold of the microscopic and with magnification strength more akin to a jewellers’ loupe, we’ve been having fun investigating the details of the liminal world and preparing specimen with our plug-and-play laboratory.
 It was by observing a shaving of cork that Robert Hooke first coined the term “cell” for the basic biological unit, likened to the private retreat and workshop of monastic cells—though we probably couldn’t make that leap at this resolution and with a wine cork. It’s interesting, nonetheless, what details show themselves—secrets of manufacture—like in the security features of a Euro bill.
I wonder what those micro-printed golden rings indicate off the Sicilian coast and in the Adriatic. What use could those perforated dots on the cuff serve in paper napkin making? Are they a thinble for us to get a purchase or for the presses that sort them?  We’ll see what other invisible secrets we can discover.