behind of course and the rule with all optical illusions is if it looks like it's not lined up it is lined up and if it looks like it is lined up it's not lined up so so this is perfectly collinear and the sort of classical interpretation and there's some nuance here is that basically this line has to go through the full pipeline latency of the visual system but this tracking line is predictable so your visual your perception just sort of puts it where it really is in real time so so this is and then there's another weird things