Yes: At a smentic linguistic level. Not as a physical substance. At which point you ask: What is a physical substance formally? Well, that depends on your dicti

Yes: At a smentic linguistic level. Not as a physical substance. At which point you ask: What is a physical substance formally? Well, that depends on your dictionary of the world. Cognition is relative, people don't get that :) There is no absolute knowledge. There are only interpretations of individual participants. And our programming languages have to reflect that.