5: Seven
Travelling East along the Piccadilly Line, on from Knightsbridge, two stations later you arrive at Green Park. Green Park sits on both the Piccadilly (blue / purple) and Jubilee (grey) lines. If you need to change between the lines there is a long tunnel that connects the two.
Look closely and you'll see that the design on the wall of the tunnel is made up of small tiles: white predominantly, purple and grey tiles. Towards the Piccadilly Line side of the tunnel the density of purple tiles is greatest, towards the Jubilee Line end, grey predominates.
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