One of the four brain wave patterns, the delta state is typified by patterns that repeat at the speed of .5-3 Hertz (cycles per second). People in deep sleep or who are unconscious are in the delta state. It is also the speed of the brainwaves typified by some forms of very deep meditation. The other brain wave patterns are alpha, beta, and theta.
Kitchen Table Tarot: Pull Up a Chair, Shuffle the Cards, and Let’s Talk Tarot
At the time of this writing (late March 2020), I keep thinking about the Wheel. I wonder where we will be on the Wheel when this is posted....