The colors did not scan in perfectly--the orange is more orange-y than it's appeared yet on my screens.
The black lines going straight across the circle connect the pairs of complementary colors: red-green, orange-blue, yellow-purple. Each pair consists of 1 primary and 1 secondary color.
The blue lines (which ended up forming a 6-pointed star!) connect the pairs of analogous colors: red-yellow, orange-green, yellow-blue, etc.