So, I understand Direct Realism to be the idea that our experience (mental activity/sense experience) gives us exact information about matter as it truly is. In other words, objects that exist in the world have the properties that they appear to us to have. This understanding puts me at odds with the common arguments against it.
The argument from illusion for example:
Premise 1: there is a stick halfway in a transparent jar that appears to bend due to refraction.
Premise 2: If direct realism is true, things are as they are and their properties are real.
Conclusion: The refracted stick really is bent or direct realism must be false.
My question is, can't I count on the real properties of water and light to explain the behavior of reality? Sure I am seeing an illusion, but why am I not seeing a real illusion? Why can't my senses directly tell me that I am seeing an illusion and thus avoid this argument altogether?
Same issue with the time-lag argument:
Premise 1: Light takes time to travel from the sun to the earth. (The properties of light and of our eyes tell us that there is a delay, however small, between the light closest to the sun and the light closest to the Earth).
Premise 2: Because of the delay, the objects when we perceive them are in their past state compared to the state they are currently in. The sun then, is temporally ahead of whenever I perceive it
Premise 3: If direct realism is true, things are as they are and their properties are real.
Conclusion: The state of the sun is never as I directly perceive it and thus, direct realism is false.
Again, why can't I count on the real properties of light, eyesight, and matter to explain that I am really viewing the sun as it is? The sun, by definition, must obey the properties of light-time delay. If I were further away from the sun, the properties of the sun remain real and the time delay is longer. If I were closer to the sun, the time delay is shorter. I am viewing the sun with the understanding that light-time delay is essential to the sun - it is what makes it the sun. I maintain that I am viewing reality directly as it is.
If anyone can help me understand this, I'd really appreciate it.