During the weekend just gone I watched three items of TV or film made at intervals of twelve years, the first having first been broadcast fifty years ago this year.
The first item I watched was the second ever Doctor Who adventure which first introduced the eponymous villains, "The Daleks" which was first screened in 1963.
I then watched "Genesis of the Daleks" made twelve years later and first broadcast in 1975, and finally a 1987 medium-budget film.
Seeing these three items over a weekend and comparing them with each other and what is available to watch in 2013 brought something home to me: we do not always fully appreciate the pace of technological change, or indeed social changes (such as changes to attitudes and accents) because they are taking place around us gradually all the time.
It's only when you look at the changes over a decade or more that it hits you how much things have changed over the lifetime of people who are only middle aged.
Picture quality: sound quality: capabilities of the special effects used: the progress in twelve years between each programme or film, and the further jump to what we experience now, was very striking.
The most valulable thing we can teach our children is to be able to cope with change. So many of the everyday things of the second decade of the 21st century would have astonished me as a small child.
And the most confident prediction we can make about the 2050's, when my children will be the same age that I am now, is that we cannot imagine how different things will be.