6 August

Give a kid lenses to play with and you can change their lives, I think. Lenses have fascinated people forever, not just in the way they shape images but also in the colours they produce from light. What’s less known is that a concave mirror can also act as a lens, you can try this with any shaving mirror. It won’t just reflect light onto a nearby wall, it’ll reflect an entire image. Do images float through the air, and get ‘bent’ by lenses and mirrors? Think I’ve asked that one before. We all tend to learn that images do this, move through the air in some way, and even enter our eyes. I think that’s bollocks, seriously how would that work?