Lateral Thinking Brain Teaser with Answer

If we observe things around us, we will find many puzzles around us. Here is one such puzzle observed at London Metro underground station. However, this is true for most of the underground metro stations. Can you wear your lateral thinking cap and solve this out of box thinking puzzle?
Lateral Thinking Brain Teaser
Can you solve this lateral thinking puzzle?

The answer can be viewed by clicking on the button. Please do give your best try before looking at the answer.

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