Herbart addresses the problem by appeal to the laws of reproduction (treated in the section on psycho-mechanics, above) (SW VI: 89). The representing (activity) of the spatial must in some way resemble the spatial itself, or else its spatial repraesentātum would in no way be “spatial”.  And this resemblance lies in the multi-dimensional nature of the interweaving of representational series. As Stout simplifies Herbart’s presentation, 