If you spend a lot of time on the Tube, it's a pleasure going past the older, more decorative stations around the city centre.
Take Baker Street, for example.
Nice tiling, right? Adds a bit of character.
The same goes for King's Cross.
Well, it turns out that such decorations weren't originally just for show.
As the world's oldest underground railway - opening back in 1863 - things were a touch different back then.
For one, the Tube's earliest riders were far more likely to be illiterate.
According to Mental Floss, the designs were originally subtle and abstract, such as Covent Garden's unique yellow tiling patterns.
It'd be hard to mistake it for another stop, right?
And as literacy improved over time, creating these tiling arrangements became more of a game, and so they became more pictogram-like.
Take Warren Street - it has a maze design.
If you look up the definition of 'warren' it's "a densely populated or labyrinthine building or district". Makes sense.
And let's go back to Brixton again:
Geddit? Bricks-ton. A ton of bricks.
Very interesting stuff.
Feature image: Tom Page