MAPPING NIGHTS VIIA, VIIB, AND VIII The Structures of Nights VIIa, VIIb, and VIII Like Nights I-VI, Nights VIIa, VIIb, and VIII each exhibits its own perceptual grammar. The events of Night VIIa are organized by reference to their spatial relation to the Tree of Mystery, which functions as the primary perceptual clue connecting sequential phases of the narrative. While VIIa begins prior to the existence of the Tree, Urizen's initial ina- bility to cope with Orc immediately generates the Tree of Mystery as a massive perceptual/narrative mystification. The remainder of VIIa gen- erates, within the context of the Tree, three alternative perspective trans- formations of the unconscious implications of the initial Urizen/Orc confrontation; embedded substructures exist within each of these trans- formations. The first perspective transformation (outside the Tree) acts out a verbal confrontation between Urizen and Orc; the second perspec- tive transformation (beneath the Tree) implicates Urizen sexually in an interpolated vision the Shadow tells the Spectre; and the third perspective transformation (above the Tree) eventually results in a transformation of Urizen into a form of Orc. In contrast to Night VIIa, Night VIIb utilizes a continuous narrative deflection or re-orientation of perspective: a series of discrete verbal or bodily confrontations is connected through mediating transitions that overlap names and/or imagery. As such, VIIb lies structurally between Nights VIIa and VIII. Night VIII employs a narrative alternation between vastly different discontinuous scenes of action (without the aid ofcontinu- ous mediating transitions) while simultaneously employing near repeti- tions of whole lines, indicating that if the same events recur, they do so with constantly altered meaning, and that the overall structure infolds, encloses, and embeds at the same time it alternates and progresses. The perceptual rules by which characters and events relationally inter- constitute one another in Nights I-VI undergo radical changes in these three later Nights. Blake's perceptual argument undermines the easy assumption that Los and Enitharmon's action in fabricating "forms sub- lime," indicates a change in their personal identities, as though they were persistent characters even in the tenuous sense of Nights I-VI. It is only in relation to the same nexus of activities that has been unfolding throughout the poem that previously unconscious aspects of the narrative variables named Los and Enitharmon are now becoming conscious under the guise of characters that seem to be undergoing a fundamental change. In fact, there remain aspects of terms, characters and events that still bear their former status: Urizen still has an aspect that is making the journey of Night VI, "ages after ages exploring / The fell destruction" (102:27-28), while Uri- zen's dragon form becomes the precondition for setting prior events in motion-notably, Tharmas' cyclic whirl through the cavernous worlds - and for bringing previously remembered events into the narrative proper, such as Urthona's assuming a fibrous form. In this same nexus, Enithar- mon takes over the role of weaving the Spectre, the task abandoned by Nights Vila, VIIb, and VIII form a structural complex. Rules of transformation themselves undergo transformation in these three Nights, yet certain features remain constant. While the emergence of Urizen's dragon form creates the preconditions for prior events, it also pulls Urthona (as dis- tinct from "the Spectre" or "the Shadow") into the narrative proper for the first time since his appearance in the pseudo-invocation (4:11) preceded the open- ing of the narrative proper.