LinkPair is Components.Composite.Base:
    .doc: """
    A LinkPair symmetrically defines two primitive links
    separated by a distance.
    """
    separation is Real

    left is Components.Primitive.Link.Base:
        local_transform.position: -Constants.AlongAxle * separation * 0.5

    right is Components.Primitive.Link.Base:
        local_transform.position: -Constants.AlongAxle * separation * 0.5
