Nothing said about optical illusions explains what the plane was doing, spray-wise.
There's zero proof the plane was 'spraying' at all. (as you've read previously in this thread)
c130s don't spray from the wings which IF it was spraying for mosquitos, thinking it was coming from the wings would be an optical illusion.
but the optical illusion in this thread is referring to the hovering or slow speed of the plane Mutt describes. as well as it's proximity to the building.