THE "NOTAE, SUCCESSIVE SCRIPTAE INTER ANNOS 1620. 1630."
This magical rite to which it corresponds is a basis for teaching astronomy, because it is in no way spontaneous or extemporaneous;
yet, every disentangled answer stands in need of calmness, recollection of the senses, and mental images.
I had often repeated this at Prague in those years in a special practice of certain observations, as often as spectators and observers gathered around me.
At first, I used to draw myself away from their conversation by going to a nearby corner of the house,
to shut out the light of day, to make a small window with the smallest opening, to cover the wall with a white cloth.
Once all this had been prepared, I used to gather spectators.
Were these my sacred ceremonies, or my religious custom, my signs?
I thought it fitting for spectators that I inscribe on a blackboard
-There lies the magical rite-
the figure of capital letters turned backward, as they are written in Hebrew.
I hung this tablet outside with the place of the letters turned to the Sun, so that what I had written on it toward the inside would be depicted on the white wall in an upright manner;
and if the wind were to move the tablet outside, the letters inside would move backward and forward in a wavy motion on the wall.