[sciconoclast (OP)]

This is an interesting picture.

I came across this pattern by accident when setting up for another experiment. It seems if level but slightly horizontally  divergent light paths pass through vertical double slits at slightly different elevations, the nodal lines in the interference pattern are skewed to be perpendicular to a line between the two paths as they exit the double slit. Not to a flatter line between the two centers on a target screen, whatever the distance to the target screen.

If the lower path still enters at the same elevation but is angled upward to converge at the target screen the nodal lines are still at the same skewed slope. If it still enters at the same elevation but is angled up farther to cross the other path shortly after leaving the double slit, then there are two double slit interference patterns, one above the other, and the nodal lines are perfectly vertical.

I have an idea as to what this means but I am interested in knowing what you guys and gals think it does.