Pixel density is increasing on screens everywhere. The 4 inch displays of the latest smartphones show 1280 x 720 pixels, while Apple’s new Macbook Pros have 2880 x 1800 resolutions. This level of clarity is enabling new services only possible with such pin sharp displays. However, it also creates practical challenges. What happens, for instance, to a web service designed with a 1024 x 768 display in mind when it is shown at such high resolutions. Smashing Magazine has a good technical introduction to the considerations. Separately, this advertising campaign, which asked participants to colour individual pixels on a large billboard to reveal the picture underneath got me thinking about the nature of the pixels which make up digital experiences. Do designers need to understand more about the technical differences between displays, how pixels are formed and why not all pixels are equal if they are to achieve true visual clarity in their work?