> we are filming with a selection of people of varying ages to illustrate how our sensory system develops over our life time. >We would just need to walk through the park with your baby and sit on a bench We have to include pictures of mothers and babies so that people can really understand that we're talking about people just like them, and we can't use stock footage because we're creatives, and anyway it has to be up-to-date people just like us, and we have to put in lots of emotive audio background and other zappy graphics because ... because ... because ... Sofia, when you have the time, get to a viewing room and watch some Horizons from twenty, thirty, forty years ago. Better still, rebroadcast a few.