Example investigation · Read-only

A Pencil for the Moon

Design a writing instrument for use inside a lunar habitat. It must be easy to find, usable with reduced dexterity, create minimal waste, and remain secure when not in use.

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Stage 01

Current object

A writing and marking tool used inside a pressurized lunar habitat by crew members wearing light work gloves.

Stage 02

Hidden assumptions

The user has uncovered fingers.
User dexterity
The object can rest on a horizontal surface.
GravityStorage constraints
Sharpening debris is acceptable.
Waste restrictionsDust exposure
Replacements are inexpensive and available.
Resupply frequency
The writing surface remains stationary.
Gravity
The object can be easily seen and recovered.
Light and shadowGravity
The current grip size works for most users.
User dexterityProtective clothing

Stage 03

Proposed redesign

Refillable habitat pencil with dock

A tethered mechanical marker with a magnetic wall dock, glove-friendly grip, and captured refills.

Enlarged, ridged grip sized for gloves
User dexterityProtective clothing
Reason: Pressurized gloves reduce fine-motor control.
Trade-off: Bulkier stowage footprint.
Open question: What grip diameter is optimal across glove types?
Mechanical refill instead of sharpening
Waste restrictionsDust exposureResupply frequency
Reason: Sharpening creates loose particles that jam mechanisms and lungs.
Trade-off: Refill mechanism adds parts to fail.
Open question: Does the refill mechanism itself shed particles over time?
Magnetic dock at each workstation
GravityStorage constraintsFailure consequences
Reason: In 0.16 g, unsecured objects drift. Docks make them findable.
Trade-off: Assumes habitat surfaces support magnets.
Open question: How reliably does the dock hold during accidental knocks?
High-visibility body colour
Light and shadow
Reason: Deep shadows swallow neutral objects.
Trade-off: May clash with medical or scientific colour codes.
Open question: Which colour reads across the widest range of lighting?

Stage 04

Bring the learning home

What did another world help you notice about your own?

Lunar challenge	Design response	Principle	Earth application	Who benefits
Reduced dexterity while wearing gloves	Larger grip and simplified mechanism	Design for limited fine-motor control	Writing tools for children, mechanics, healthcare workers, or people with arthritis	People with reduced hand dexterity
Difficult resupply and expensive replacement	Refillable and repairable construction	Long service life through repair, not disposal	Everyday consumer goods designed to be refilled or serviced instead of replaced	Waste-conscious households; repair workshops
Objects lost in low gravity	Docked, high-visibility, tethered by default	Give every object a home	Tools in busy workshops, kitchens, and shared spaces	Anyone working in shared or cluttered environments