4   +   8   =  
A password will be emailed to you.

Step 1: You watch the first minute of this strange, looping video.

Step 2: You realise that it’s a spherical 360° video, so you start using the arrows or dragging with your mouse to ‘look around’ in the video.

Step 3: You spend the rest of the night picking your brains up off the floor.

(For information/explanation/mathematics, see this blog post. Or if you prefer, just watch it while bent and have a good giggle.)