make a couple of loops one for anchoring on a hook or whatever is suitable ,,
Knit a mesh into the loop and add a mesh also,, the increase mesh..
keep adding the increased mesh on the last mesh until you have the depth of walls that you need ,, you can see 3 squares and the increase on this picture,, this makes the walls 4 deep..
Knit a plain row without any increase..
next row increase the last mesh ,, next row decrease ,, keep increasing and decreasing until you have the desired length of walls ,, to square everything up make sure the last row that's be