The burning filament of a lightbulb.
The final image consists of two separate shots + text layers.
Idea and concept are not new at all and you will find a lot of shots of burning lightbulbs out there, but this is my version, which I had a lot of fun doing.
Technical details for the shot of the burning filament,-
Canon 7D, EF 100mm f/2.8 USM, f/5.6, 1/500s, ISO 200