Some truths seem to be universal meaning they exist separate from our biology, for example: logic.

Other truths seem inextricably tied to our biology, for example: happiness.

One that is ambiguous is, Justice. To which I say the ambiguity is an illusion. Justice is like happiness. Completely unique to the human experience.

Can we derive logic without an observer that is embodied, that experience pain and pleasure?

Every experiment we do are motivated by a desired for knowledge (information to avoid pain)

Without that biological framework there is no experiment, the external observer is an illusion.

To me justice is another emergent concept of the human games, a concept that allow to maximise fitness at a larger scale. We keep track of the freeloaders and punish them so we get to a higher total fitness if we force everyone to contribute more or less equally.

>Without that biological framework there is no experiment, the external observer is an illusion.

No but we can make a guess. A hypothesis. Our observations seemingly indicate that only humans feel happy and rocks do not. Neither do plants.

But it seems like both humans and plants both obey logic.

Given that biology is required for US and YOU to do an observation, it may very well be that biology is required for observation period.. and nothing exists outside of that. But our observations present us a view that seemingly looks like a reality exists when it is not observed. One is unable to validate either conclusion. Most of us go about our day to day lives assuming the later conclusion. and thus when we assume that later conclusion is true and we look at logic... our observations clearly present to us a dichotomy between logic and happiness. Not all living beings on this planet seem to share it. But logic is universal and we assume it exists even when not observed.