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Indian File 
Arthur sets a challenge for four of the knights of the Round Table:
1 will arrange you in a line, single file, and you will not be allowed to turn around or communicate with each other!
An opaque tapestry is placed between Lancelot and the others.
Lancelot and Galahad can't see any of the three others.
Perceval can see Galahad, Gawain can see Perceval and Galahad.
I have here four helmets, two with a white feather on top, two with a black feather on top. Close your eyes while I put them on your heads. If one of you can tell me the colour of the feather on their helmet, he will win Excalibur!'
They open their eyes and, after a few moments of thought, one of the knights comes up with the right answer.
Which knight is it? How can he be sure of the colour of the feather on his helmet
I will post the answer below later
