When the world was born, there were only three colours. Then, with light and the footsteps of people, more came. And more. And more still. In this poetic and visually enchanting book, we follow a child's reflections on the colours that inhabit the world, how they appear, how they change, how they speak to us. Through curious questions, spontaneous discoveries, and brushstrokes of imagination, Blue invites readers to contemplate: colours, light, shadow, and the unique ways we each see the world. With a tender narrative voice, Blue moves readers of all ages and offers something both simple and essential: the chance to see the world with the eyes within.