Photoshop has been around for decades and has become the go to application when it comes to photo editing and manipulation. It's also used for a variety of other things such as mobile and web design.
In the last few years the design of Photoshop hasn't changed very much but maybe that's for good reason - it works. However that hasn't stopped Aurélien Salomon from creating his own redesign for the application.
Aurélien's redesign is simply an experiment and what his vision of the perfect Photoshop would look like. The design has a very minimalistic layout with a lot less visible icons and elements, and much more padding and margins.