Moonlit Bread Bag Twist-Tie Rescue
Initial state
The kitchen is lit only by the faint blue-grey glow of moonlight filtering through a half-drawn roller blind above the sink. The overhead light is off; no one has turned it on. A digital clock on the microwave casts a dull green smear on the countertop nearest the fridge. The robot is parked near the center island, facing the counter to the left of the stove. At chest-camera height, the counter is mostly dark. A loaf of sandwich bread in a white plastic bag sits crumpled and half-collapsed against the backsplash — someone pressed it flat retrieving slices and never re-sealed it. The twist-tie is visible as a small dark spiral lying on the counter about six centimeters in front of the bag; it has uncoiled partially and looks like a small loose curl of wire. A glass of water, half-full, stands to the right of the bread bag, partially occluding the twist-tie from the right camera. The ambient sounds are the hum of the refrigerator and, faintly, a window AC unit in another room. Nothing else is on the counter except a folded dish towel bunched against the far-right corner.
Goal state
The bread bag is re-sealed with the twist-tie wound at least two full turns around the gathered neck of the bag, the neck gathered tightly enough that the bag interior is not exposed to air. The bag remains upright or on its side on the counter — it does not need to be moved. The twist-tie is not dropped on the floor. The glass of water is undisturbed.
Objects involved
| Name | Descriptor | Role |
|---|---|---|
| bread bag | white translucent plastic, soft, partially deflated, full of sandwich bread slices | target |
| twist-tie | thin black wire coated in paper, partially uncoiled, roughly 8 cm long | tool |
| glass of water | clear glass, half-full, on the right side of the bread bag | obstacle |
| dish towel | folded cotton, bunched in far-right corner of counter | distractor |
| roller blind | half-drawn white fabric, the primary light source via moonlight | distractor |
Expected actions
- 1. approach counter to the left of the stove until bread bag is within comfortable reach of both arms 4s
- 2. pick up twist-tie from counter surface using right-hand gripper, pinching gently to avoid bending it further 6s
- 3. grasp the open neck of the bread bag with left-hand gripper, gathering the loose plastic folds together into a narrow bunch 8s
- 4. slide the gathered neck of the bag through the loop of the twist-tie while left hand holds the bunch stable 7s
- 5. twist the right-hand gripper to wind the twist-tie around the neck two full turns, maintaining light squeeze pressure so it does not slip 10s
- 6. release right-hand gripper and verify the seal is snug by gently pulling left-hand gripper away from the neck; if the tie holds, release left hand 8s
- 7. set down the sealed bread bag upright against the backsplash in its original position 5s
Narration script
Edge cases
- The twist-tie has been bent into a rough S-shape and cannot be easily threaded through the bag neck without first roughly straightening it against the counter edge with one gripper.
- A cloud passes and the moonlight dims further mid-task, making the contrast between the twist-tie and the dark counter surface drop to near zero; the operator must rely on the last known position and tactile resistance cues.
- The bread bag has only one or two slices left, making the neck extra long and the plastic especially floppy — gathering and holding the neck requires more pinch force than expected and the bag may tip sideways when released by the left hand.