In Integral Psychology (2000) the mystical states (psychic, subtle, causal, nondual) are drawn as the top four rungs of a single developmental ladder.
2000: one spine of basic structures. Psychic, subtle, causal and nondual are drawn as its top rungs.2006: the four become states, running across the top of a grid.The six structure-stages run up the side of the grid.Every cell is a state experience interpreted through a stage: a person at any stage can have any of the states.The settled diptych, with Wilber's sentence and the honest note that IP already said this. This is the shareable image.
In Integral Psychology (2000) the mystical states (psychic, subtle, causal, nondual) are drawn as the top four rungs of a single developmental ladder. In Integral Spirituality (2006) the same words name a second axis. They are states that can be experienced at any stage, and each experience is interpreted through the stage of the person having it:
"…gross/psychic, subtle, causal, and nondual were no longer stages stacked on top of the Western conventional stages, but were states (including altered states and peak experiences) that can and did occur alongside any of those stages."
Ken Wilber, Integral Spirituality (2006), ch. 4
What changed is mostly the picture and the weight put on it. Integral Psychology already says these states are "available to human beings at virtually any stage of growth" (ch. 1), and traces the grid idea back to A Sociable God (1983). More: From SES to Integral Spirituality.