THERE IS A MEMBRANE, in fact I sense many, stacked in layers, but one that is ultimate and separates the lower-level experiences from the "breakthrough" plateau. When the dosage is just right, I can "ride the edge," so to speak, existing half in and half out of Salvia space, and I find this most accommodating for my own experiments. However, full-blown barrier crossings and less intense journies to the edge can be rewarding as well.