Capes of Red and Green

Because red and green are opposites on the colour wheel, the dualism of Thor and Loki is immediately identifiable by their iconic capes.

[by boscribble]

The Odinson brothers are eternal forces of difference, whether they are engaged in conflict . . .

[by westishere]

. . . or in less combative emotions.

[by westishere]

And even, once in a while, when they are cooperating with each other.

[from Captain America + Thor:

Avengers 1 (2011),

found here]

The very hang and flow of their capes reflect the diametrical opposition of Thor's extroversion and Loki's introversion.