Retro Metro

Houston.. we have a problem! 
Day 2 into tiling the walls and silly old me decides to read up on the subject of installing wall tiles, as you do! 
Seems protocol dictates tiles should be spaced at 3mm. These have been spaced at 1mm!
I've only just gone and spaced out!
But, after phoning the lovely tiler he reassured me that these tiles are  very small so 1mm is fine and they won't keep pinging off the walls!
He'd better be right....
Or else....
Music maestro...
https://www.youtube.com/watch?v=RxhN7MQ6uYw