Micro-gaze
A method of approach that I would like to call the ''Micro gaze'' is crafted to observe without drawing attention. ', it is a way of observing with a short duration of time of the gaze. Its duration is no more than half a second to one second. This can be done up to three times, but if you do it more than that, make sure it's as little as possible.
By utilizing micro-gaze, you can remain hidden and avoid extended looks that might betray the act of observation.
This method is a pillar of indirect observation techniques because it allows accuracy and requires us to use memory and imagination to form imagery of 'what we are observing' in our head.