Common Household Objects That Still Defeat Robot Hands

A useful reality check on how far manipulation still has to go, one everyday object at a time.

It's a genuinely useful exercise, when evaluating a manipulation demo, to ask how it would handle a handful of ordinary household objects that remain surprisingly hard for robots.

The usual suspects

Thin, flat objects lying on a table (a single sheet of paper, a credit card) are hard to get a grip under without a fingernail-like edge. Deformable items — a shoelace, a plastic bag, a piece of fabric — don't hold a predictable shape a grasp planner can reason about. Transparent or highly reflective objects (a glass, a mirrored surface) confuse depth cameras that rely on light reflecting predictably.

Why this list is a useful sanity check

A demo video showing a robot smoothly handling rigid boxes and cups says relatively little about how it would fare with any of the above — genuinely useful context for reading manipulation demos with appropriately calibrated expectations rather than assuming a shown capability generalizes broadly.