You were correct. The light source is an external reference; the koan may no longer be valid if you were to move the table. On Jul 29, 2011, at 1:16 PM, Brian McCue <brianmccue22312@xxxxxxxxx> wrote: > The Zendo rules forbid external references, other than to the surface on which the pieces rest: BNs can't refer to, e.g., "a flat pyramid pointing North," or "the pyramid nearest the Master," or even "the pyramid nearest the edge of the table." > > Last night, a player wanted to know if the BN could be something like "the shadow of a large pyramid falls upon a small pyramid." I said no, on the grounds that it was a forbidden external reference, but then somebody asked what was external about it, and I had a hard time saying. > > Was I right anyway? > > Brian > _______________________________________________ > Icehouse mailing list > Icehouse@xxxxxxxxxxxxxxxxxxxx > http://lists.looneylabs.com/mailman/listinfo/icehouse