One lidified orbit, both top and bottom are active… next to a solid all out eye(which is more technically appropriate for h-crab biomimicry, they gots no lids, more like spider/crab sensing clusters, the beginnings of sight, would be most fun to replace these later with a similarly functioning set of light sensors and get his behavior within the constraints of the real thing.)

Anywhose, also makes an interesting face with one of each.