[zarzavat]

The way that XKCD did it is the best, you ask people to give a name to each color then the responses are entirely natural and unprompted.

I don’t think that forced choice can give accurate results if a substantial number of people perceive green and blue as being non-adjacent - i.e. there exists a color between green and blue (turquoise/cyan/teal).

Otherwise it’s like asking people whether a color is red or yellow, when it’s clearly a shade of orange.

[ljsprague]

Some shades of orange are closer to red and some are closer to yellow.

[zarzavat]

Yes but saying that a shade of orange is closer to yellow is different from saying that it is yellow.

Orange is closer to green than blue but I wouldn’t say that it’s a shade of green. It’s just orange.

[cubefox]

> Otherwise it’s like asking people whether a color is red or yellow, when it’s clearly a shade of orange.

No it's like asking people whether a color is red or green, when it's clearly a shade of yellow.

https://en.wikipedia.org/wiki/Color_wheel#/media/File%3ALine...