Indirect Realism is the view that:
The external world exists independently of the mind (hence, realism [philosophical])
But we perceive the external world indirectly, via sense data (hence, indirect realism)
Indirect realism says the immediate object of perception is sense data. This sense data is caused by, and represents, the mind-independent external world.

Sense data can be described as the content of perceptual experience.
It’s not a physical thing, it exists in the mind. However, sense data is said to be caused by and represent mind-independent physical objects (see diagram above).
Sense data is private. No one else can experience your sense data.
This avoids the problems with direct realism described above. For example, differences in perceptual variation can be explained by differences in sense data. The object itself stays the same throughout even if the sense data changes.
Often the Indirect Realist is contrasting his realism against Direct Realism.The Veil of Perception
Indirect realism invokes the veil of perception.
All we actually perceive is the veil that covers the world, a veil that consists of our sense data.
What, then, justifies our belief that there is a world beyond that veil?
In drawing the focus of our perception away from the world and onto inner items, we are threatened by wholesale skepticism.
Since we can only directly perceive our sense data, all our beliefs about the external world beyond may be false.
There may not actually be any coffee cups or olive oil tins in the world, merely sense data in my mind.
https://iep.utm.edu/perc-obj/#:
In a way, Indirect Realist is more realistic than Direct Realism, but that does not enable Indirect Realist to pass the veil of perception trigger by their assumptions of an absolute mind independent external world.
My point:However, for this to be a strong objection to indirect realism, it would have to be the case that direct realism was in a better position with respect to skepticism, but it is not clear that this is so.
The direct realist does not claim that his perceptions are immune to error, simply that when one correctly perceives the world, one does so directly and not via an intermediary. Thus, things may not always be the way that they appear to be, and therefore, there is (arguably) room for the sceptic to question one-by-one the veracity of all our perceptual beliefs.
ibid
My charge is, the indirect realists' claim is a farce because to insist there are real things beyond the empirical world and the veil of perception is delusional.
The onus is on indirect realists to prove there are really-real-things beyond the veil of perceptions to show they are not delusional.
The more realistic realism is Kant's Empirical Realism which does not assume based on faith there is an absolutely mind-independent reality out there existing regardless whether there are humans or not.
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