Mix A Pixel is a hands-on learning artefact that introduces children to the red, green and blue light behind every digital screen. Developed for a Physical Computing course, it turns RGB from a static diagram into something children can manipulate: three physical sliders set values from 0 to 255, and the colour on screen changes instantly.

Children begin with a reference colour and experiment until they recreate it. When the match is close, pressing a button lights every LED-matrix pixel that uses that colour. Repeating the challenge gradually reveals a complete image. Through play, children see how RGB values set the colour of individual pixels and how those pixels form the image on a screen.