Here is a good detailed review of Case Against Reality with some useful comparisons. Some snippets:
Hoffman spends considerable time describing various philosophical positions and positioning his perspective among them. He acknowledges predecessors with similar views, such as Immanuel Kant. Philosophers have various objections to Interface Theory of Perception (ITP), and he counters all that he discusses. Here I won’t try to adjudicate these disputes but instead to outline Hoffman’s view.
Followed by a very succinct statement of 'conscious realism':
Hoffman supports a monist philosophical position that he calls “conscious realism.” In it, the world is populated by conscious agents that influence each other and perceive each other. He distinguishes conscious realism with panpsychism, in which physical objects can be conscious. In conscious realism, there is no requirement that the physical reality behind our interface is itself conscious. The point is that what we usually call reality, including objects and spacetime, is generated by each conscious agent through a perceptual interface arising from consciousness. Conscious entities only perceive icons, not reality, and do not directly perceive other conscious entities, only their icons.
To me, it has always seemed strongly reminiscent of Leibniz' monadology. 'According to Leibniz, monads are the fundamental units of reality, which are simple, indivisible, and unextended
substances subjects.
For Leibniz, monads are the basic building blocks of the universe, and all things, including physical bodies and even human souls, are made up of monads. Each monad has its unique qualities, which determine its specific nature and behavior. Monads do not interact with each other directly, but rather each one reflects the entire universe within itself, creating a harmonious pre-established harmony.'
In other words, 'conscious agents all the way down'. Whitehead's 'actual occasions of experience' also come to mind, although I've never really been able to get my head around that.
Another point worth making:
Hoffman says the FBT ('fitness beats truth') theorem applies only to perceptions of the world (90-91). Cognitive capacities need to be studied separately to see how they are shaped by evolution. Not all evolutionarily derived capacities are necessarily unreliable. Indeed, there can be selection pressures for ability with logic. For example, the value of reciprocity for humans can contribute to selection for logical ability. Hoffman says skills in mathematics and logic can exist compatibly with the FBT theorem and with Interface Theory of Perception (ITP), but whether concepts in mathematics and logic enable understanding of objective reality remains to be seen.
This partially addresses the question of why science itself ought not to be considered also a perceptual illusion. However further down, we read:
Hoffman says science has evolved in a way that draws on features of human nature: people argue best for what they believe or against contrary ideas that others believe (196). Reasoning evolved for the purposes of persuasion, and science arose from these inadequate foundations via groups and individuals mustering logic and evidence against opponents. This perspective on science is contrary to the common view, at least among scientists, that scientists should be objective. Hoffman’s evolutionary picture is more compatible with the analysis of Ian Mitroff (1974), who found that elite scientists fiercely stuck by their preferred views and attempted to undermine contrary views (and denigrated scientists holding those contrary views). According to Mitroff, scientific norms such as organised scepticism exist alongside “counternorms” such as organised dogmatism, and the counternorms can be functional for scientific progress. Mitroff’s picture might be a starting point for an evolutionary model of science.
I am always dubious about attempts to explain the capacity of reason with reference to evolution, as it always seems reductionist to me. After all, reason ought to be the source, not the subject, of whatever explanations we are able to discern. This is why I make frequent references to Thomas Nagel's essay Evolutionary Naturalism and the Fear of Religion, which elaborates the point: if reason is only the product of adaptive necessity, then why trust it? Classical philosophical theology has an answer for that: the mind contains a faculty, however corrupted, which is able to discern the truth by reason. (It's also worth noting
The Fall of Man and the Foundations of Science, Peter Harrison, which argues that one of the primary impulses for early modern science was as a corrective for the corrosive effects of original sin on the intellect.)
I think from what I've read so far, Hoffman's book raises many interesting questions based on evolutionary science, but it also makes the mistake of seeing evolution as a kind of all-powerful agency, which perhaps is the lingering cultural legacy of the mythology it has displaced. 'The jealous God dies hard', something you certainly see in the polemics of the 'ultra darwinists' such as Dennett and Dawkins. While Hoffman's view seems worlds away from their lumpen materialism, his estimation of evolution as the sole creative agency in the development of life remains quite close to it, in some fundamental ways.
And overall, it leaves open the question that if, as he says, all of the objects of experience are simply icons, then what is the reality? I think he says this is not something we can know, but that is deeply problematical in my view. Still, it's a developing field of enquiry, and some grander truth behind the illusion of desktops and icons might yet come into focus.