When I was a kid my dad was a continuity announcer at the BBC. "This is BBC1" etc.
Occasionally* he took me & my sister to work when my mum was also busy.
The continuity studio was next door to the weather forecast studio (up on the top floor of TVC Wood Lane) so I got to see the _actual_ weather symbols which were made of the magnetised rubber you used to get in the 70s.
Still quite a clear memory of their odd weight...
*maybe once or twice but you know what childhood memories are like