From Tim Nichols, London, UK
For most of my life, my brain rendered the moon as a flat disc or crescent in the diamond-studded canvas of the night sky. However, I discovered that if I think of the moon as spherical while I look at it, it pops out that way. Instead of a flat object, I see it for what it is: a 3500-kilometre-wide globe floating beside us in space and considered by some a twin planet rather than a satellite (16 November, p 52).
