Etch A Stretch

For today's image I decided to go for something altogether more subdued and understated than the razzmatazz of yesterday's effort. I originally thought this was the lone survivor of a set of wine glasses that my mum had but I have since happily discovered that there are two others lurking in the depths of our old sideboard. I just love how delicate and ethereal it looks with the imperfections it has gathered over time.
I'm not sure if the intricate design on the glass has been etched or engraved as they are two completely different processes. Etching is a chemical process where an etcher burns lines on to a surface with acid and can be traced back to the early 16th Century, with the first dated etching recorded as being made in 1513 by the Swiss artist Urs Graf - whereas engraving is a physical process where an engraver uses a sharp  tool to cut directly into a surface and whose history can be dated to between 540,000 and 430,000 years ago from patterns on a chiselled shell discovered in Trinil in Java.
So my blip narrative may be considered a bit of stretch from a wine glass produced by uncertain means (I only used etch in the title as engrave did not rhyme with stretch nor make a passing nod to a children's toy of a very similar name) to a half a million year-old shell!