I have been considering the meaning of parimukham lately and asked on the pali forum if anyone had any opinions on it having a temporal aspect.................http://www.dhammawheel.com/viewtopic.php?f=23&t=7453
It is not that I have a definitive opinion one way or another, it is just that the expression "setting mindfulness to the fore" is I believe an important one to understand.
I don't know if people recognise that the expression crops up in other suttas that do not appear to have anything to do with mindfulness of breathing...............http://www.accesstoinsight.org/tipitaka/mn/mn.107.horn.htmlhttp://www.accesstoinsight.org/tipitaka/mn/mn.125.horn.html
There are more if people research
One thing I have noticed is that the expression follows on from keeping the body/spine erect - setting mindfulness in front (a la chakra column?). I must express that I have no definitive opinion on the expression, only that in the context it is used in the canon it seems strange to me if that context would be "nose". I would be interested in other people's opinion on the expression "parimukham" in regards to its usage, bearing in mind its use in the above suttas.