That's another use, but 1980s Sony monitors would give a 'b/w' representation of the blue channel for subjective assessment of noise
Is it not a close up of the clock face on Big Ben?
The 9pm/11pm (and 8pm on weekends) blue stripe is a "representation" of Big Ben's face, without looking too much like it.
The 10pm stripe is - hopefully obviously - a recreated close up of Big Ben's face.
Because it looks nice?
Podcast audiences are a little hard to conclusively prove, but the Sky News Daily podcast is currently number 30 in the Apple Podcasts "News" charts, ahead of Ed Conway's "The World Tomorrow" at 34. I'm sure if you look at other services, you will be able to see their charts.
So, this happened and I’m still buzzing! 🙏🏾💃🏾 Made my debut on @SkyNews The Early Rundown programme and also presented my first afternoon slot - all in the same week! Loved every second! I’ll be back from 6am tomorrow. Hope you can join me then. ❤️🙏🏾 pic.twitter.com/12KR1xqiyp— Vanessa Baffoe (@VanessaBaffoe) July 9, 2020