Ignorance is regarding the impermanent as permanent, the impure as pure, the painful as pleasant, and the non-self as the self.
Ignorance (avidya) is of four types:
1) regarding that which is transient as eternal
2) mistaking the impure for pure
3) thinking that which brings misery to bring happiness
4) taking that which is not-self to be self.
Seeing the temporary as permanent – this could be something like thinking of our possessions as belonging to us, rather than realising that we are only their temporary keepers.
Thinking the not-self to be self – for example, identifying ourselves as ‘a doctor’ or ‘Michelle’, rather than the deeper identification of our self at a much deeper level.