Errata
Right side button band instructions should read:

row 1 (ws): k1, k1 p1 4 times, k1.
(rs): p1, k1tbl p1 4 times, k1.

buttonhole row (rs): p1. ktbl, p1 ktbl, yo, slip first stitch without working to right needle, slip 2nd stitch tbl and reseat on left needle as a twisted stitch, pass 1st back to left needle and k2tog, p1, k1tbl, p1, k1.

next row (ws): p1 k1 2 times, p1, k the yo tbl, p1, k1 2 times.

Suggested Yarn:
Mad Color Indulgence 100% Superwash Merino 215 yards/125g
4 (4, 5, 5, 5) 6, 6, 7, 7, 8 skeins Black Cherry (MC)
1 skein each Bloody Hell (CC1), Pink Tourmaline (CC2), and Ginger (CC3).

Hiro (pronounced “hero”) is the main character in a favorite Neal Stephenson novel of mine, Snow Crash, the title of which also describes the way colors digitally fade into each other in the yoke of this sweater. Originally inspired by a textile from the Swedish design firm Little Red Stuga, I wanted to add a color gradation to their genius play of black and white. The pattern came first, the name followed, but it still makes the scifi geek in me happy.

This pattern includes instructions for both a pullover and a cardigan version. This sweater is worked seamlessly from the bottom up.

Charts are graded according to size.