Issues with direct realism

Question 1

Perceptual Variation

Answer 1

An object may look differently depending on the angle and conditions we view it in.
e.g flower through a microscope has a different colour to it than how it looks to the naked eye.

Question 2

Argument from illusion

Answer 2

What we immediately perceive cannot be what is in the world , since what we are perceiving is not the same as what is really there.

e.g a stick in water appears bent when we know it is actually straight.

Question 3

Argument from hallucination

Answer 3

Perceiving something when in reality there in nothing there at all and so it does not exist , such as Macbeth when he saw the dagger , However it was not real but he believed it was.

Question 4

Time lag argument

Answer 4

It takes time for light to travel , therefore light from distant stars take a long time to travel . So we can perceive something that does not exist any more , but the star was so far away that the light took years to travel and so we do not directly perceive objects.