A couple of tangents. Thanks to the timeless nature of the PDF format (and the supporting applications), I'm able to read a digital content created 3 decades

A couple of tangents. Thanks to the timeless nature of the PDF format (and the supporting applications), I'm able to read a digital content created 3 decades ago. What also blows my mind is that virtually everything about computers has changed over these decades and yet, here I'm reading this brilliant paper. There is something about the PDF format that gives me real joy just to look at the beautifully rendered content -- letters and pictures. For me, no other format comes close to PDF. In the physical world Springer books are a good match but that's probably because they are typeset in PDF too.