Seems right; but I can't help thinking all we do that is not related to the physical is, by definition, imaginary. We THINK we're doing things, but its all fantasy stuff - art, math, philosophy. Imagine a different biology of intelligent beings - maybe an amoebic colony-mass of semi-intelligent cells that create a group brain. What would their philosophy look like? Would they have trade or commerce or families or anything we would recognize? I think No.

But they have 'left their substrate' too. Yet there's no common ground with us. That means, most of what we do 'beyond our biological goals' is in fact still rooted in our biology.