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BmyGuest
  • 18.4k
  • 2
  • 72
  • 154

The central star should be coloured:

Indigo (dark blue)

The reason is, that if you draw a hexagonal grid across everything like this (excuse the sloppy photoshop work):

enter image description here

enter image description here

Then, for any given dot, you simply:

count up the number of dots on any of the intersecting lines, which will always give the same sum, based on the colour of the dot you chose:
Red - 0
Orange - 1
Yellow - 2
Green - 3
Blue - 4
Indigo - 5
Violet - 6

The central star should be coloured:

Indigo (dark blue)

The reason is, that if you draw a hexagonal grid across everything like this (excuse the sloppy photoshop work):

enter image description here

Then, for any given dot, you simply:

count up the number of dots on any of the intersecting lines, which will always give the same sum, based on the colour of the dot you chose:
Red - 0
Orange - 1
Yellow - 2
Green - 3
Blue - 4
Indigo - 5
Violet - 6

The central star should be coloured:

Indigo (dark blue)

The reason is, that if you draw a hexagonal grid across everything like this (excuse the sloppy photoshop work):

enter image description here

Then, for any given dot, you simply:

count up the number of dots on any of the intersecting lines, which will always give the same sum, based on the colour of the dot you chose:
Red - 0
Orange - 1
Yellow - 2
Green - 3
Blue - 4
Indigo - 5
Violet - 6

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Alconja
  • 37.8k
  • 16
  • 119
  • 167

The central star should be coloured:

Indigo (dark blue)

The reason is, that if you draw a hexagonal grid across everything like this (excuse the sloppy photoshop work):

enter image description here

Then, for any given dot, you simply:

count up the number of dots on any of the intersecting lines, which will always give the same sum, based on the colour of the dot you chose:
Red - 0
Orange - 1
Yellow - 2
Green - 3
Blue - 4
Indigo - 5
Violet - 6