What are you if you are on the same wavelength as somebody else.
Well, you could say you have the same understanding; you see the world in the same way.
This metaphor comes from radio.
We now take for it granted that we can listen to any music we like and choose from many radio stations but it wasn't always like that.
In the UK, the big change, like a lot of others, happened in the 60's with the arrival of Pirate Radio.
Sounds interesting? It is. Here's a short film about the famous Radio Caroline. I think you'll enjoy as we're on the same wavelength.