a book, drawn by Nib

Why the world works

The everyday puzzles behind physics, astronomy and the living world, drawn so you can turn the knobs yourself.

  1. Why is summer warm?

    A page set to today, at a latitude guessed from your time zone (drag it to your own): move the Earth round its orbit, tilt the sunlight, run the day across your sky, and see why seasons come from a lean.

  2. Why is the sky blue, and sunsets red?

    Drag the Sun down and watch Nib colour the sky: why air scatters blue, why the sky isn't violet, why sunsets are red, why clouds are white, and why Mars has blue sunsets.