See also: Vertical Mesh
Row 1 (RS for evens, WS for odds): K2, #sl1-k2tog-psso, (yo) twice, repeat from #, k2
Row 2: K2, #(p1, k1) into the double yo, p1; rep from #, end k2
Row 3: Knit.
Repeat Rows 1-3.
Shown with a cast-on count of 10 stitches.