Puts it in parenthesis

1. What does "puts it in parenthesis" mean?

2. Does "to turn it on its head" mean "to reverse it"?

3. Does "loses itself in the external object" mean "dissolves in the external object"?

Context:

Acconci seems to want to escape from secondary narcissism, which pivots on the binary of self-enclosure and destructive desire, that is, ‘I seal myself up to protect myself but in order to do so I have to cast you as different and outside of myself, which may end in your actual destruction, because I hate difference.’ In his video performances, Acconci seems to me to be aware of this dialectic, and puts it in parenthesis in order to turn it on its head. As opposed to Krauss’s assertion that ‘the artist only finds his subjectivity by recognising the material and historical independence of an external object (or medium)’, there might also be a case to be made for the discovery of a subjectivity that loses itself in the external object (or medium) which expands its relation to the otherness within, exploring the fact that, like Shelley’s monster, we are all made up of parts of others, what psychoanalysts might call ‘imagos’, and haunted by their traces.