I was fixing a mirror reflection on a bus window render and a retired train conductor sitting behind me at the library cafe asked why my grid lines kept distorting. He grabbed my laptop and rotated the whole object 45 degrees on the Z axis, then said 'checkerboards only line up when you stop fighting the perspective.' It fixed my material seams in 20 seconds after 3 days of guessing. Anyone else get random real-world advice that solved a Blender issue on the spot?