History
of Laws of Form

1969 - Original Publication

1972 - Second Publication
	This edition was published in America. A second preface was added relating to ordinary imaginary numbers and the elimination of the Whitehead Russell Theory of Types. 4 pages.

1973 - American University of Masters Conference at Esalen
	A discussion of Laws of Form led by George Spencer-Brown at the Esalen Institute on the California coast, March 19-20, 1973.

1975 - von Meier Teaches Laws of Form
	In the spring semester of 1975 at Cal State, Sacramento, Kurt von Meier taught an experimental art course based on Laws of Form.

1979 - Third Publication
	A third preface was added relating to the four colour map theorem.

1994 - Fourth Publication (German edition)
	A fourth preface and an extraduction were added including "Appendix 3: Bertrand Russell and the Laws of Form" (bilingual), "Appendix 4: An Algebra for the natural Numbers" (English only), and "Appendix 5: Proof of the Four-Color Theorem" (English only).

1997 - Fifth Publication (2nd German edition)
	One more appendix was added, "The Prime Limit Theorem". At least one of the German editions is available from the publisher Bohmeier Verlag.

1990 - Human Interface Technology Lab is established
	A virtual reality laboratory is started in Seattle, with William Bricken hired as principle scientist. Part of his research program is the pursuit of boundary mathematics.

1992 - Interval Research is established
	Paul Allen and David Liddle found a new long-term research lab in Palo Alto. Richard Shoup, William Bricken, and colleagues explore techniques relating Laws of Form to reconfigurable computing. (Interval closed in April 2000.)