# @optica.worldwide on Instagram

- **Type:** Image
- **Original URL:** https://www.instagram.com/p/DV2JZB8DZtY
- **Gondola URL:** https://gondola.cc/posts/59544276-opticaworldwide-instagram
- **Thumbnail:** https://img.gondola.cc/tr:w-,h-,fo-auto/postThumbnails/f416cc1a73.jpg
- **Posted:** 2026-03-14T01:15:07.000+00:00
- **Account Owner:** Optica (@optica.worldwide) — https://gondola.cc/optica.worldwide

## Caption

A geometric-phase timeline.

Global change without local change—a connecting idea in the physics of optical, quantum and other waves—has a multistranded history spanning two centuries.

This photo shows a view near Skreen, in the west of Ireland, through a thin crystal sandwiched between crossed polarizers. 

The dark band across the interference fringes corresponds to a geometric phase of π. [M. Berry].

Find out more under Celebrations, link in our bio!

#PiDay, #πDay, #PiDay2026, #3.14

## Stats

- **Views:** 0
- **Likes:** 87
- **Shares:** 0
- **Comments:** 0

## Tags

3, πday, piday, piday2026

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