Oculeus means “with many eyes”.
The “eyes” of this hat form by working dropped stitches.
The three-dimensional effect of this pattern is visible in single or multi colours (no intarsia-knitting).

The pattern is given as a chart.

Women’s Size: about 56 cm circumference · 96 stitches
Men’s Size: about 58 cm circumference · 104 stitches

Gauge 4 x 4 inches (10 x 10 cm): about 22 stitches and 32 rows with needle size 4 (3.5 mm) in stockinette stitch (before washing)