Interesting! Most sweaters I do are circular cast on too. Though admittedly myself and my knitting circle seek out in-the-round patterns. Ive never been fond of stitch and flip classic needles

Yes, the cabled needles allow me to hold the edges of the polygons in place while I knit inward and shink bigger shapes into tiny triangle points at their centers where they meet

Yup, knit on 24 inch circular cable needles in size 1. Its knit as one piece with each shape cast off from the edge seam of its neighbors. The only sewing is attaching the eyes

I tried crochet but it just wasnt for me. Amigurumi is cute though