How do you identify gentrification? Well, according to CityLab, nothing is more telling than Edison-style incandescent lightbulbs.

The article's author, Thomas J. Campanella, explains that different people are drawn to different types of light. In China for example, harsh, bright light is a sign of affluence, while in the Western world most people find a lower color temperature to be warm and intimate, kind of like a candlelit dinner.

Enter the Edison bulb.

It all started in the ’80s when Edison bulbs were reproduced for collectors. The bulbs slowly made their way onto store shelves until, in the mid-noughties, incandescent lights were banned due to the Energy Independence and Security Act. There were some exceptions, however, with “decoratives” like the Edison bulb being one.

Apparently, it’s just hardwired into our brains: we’re attracted to softer, warm light. Most incandescents that provide light were banned due to their wastefulness. The Edison survived as a decorative and now, due to how they are more expensive, only trendy, hip, gentrified businesses use them.

And that is why Edison bulbs are not just the only light bulb you'll ever know by name but are also the poster child of gentrification bar none.

Speaking of the hip and trendy, feast your eyes on Europe’s first underwater restaurant.