First suggestion: a powder that can only be moved on the x axis, it would be helpful for electronics saves, it would be called x.
Second suggestion: a powder that can only go on the y axis, same scenario it would be called y.
There is pistons and other stuff like anti-air, why these useless unforgivable sins of X and Y powders, when you can take a practice at learning how to use pistons and CRAYS like i did
cause air cant move them on other axises and piston can just mess up
it is meant to be able to go in one direction with nothing else blocking it, ect piston can only go as far back after the original pstn pixel is placed