The dignity gap in dementia care
Most assistive products for Alzheimer's patients fall into two categories: pharmaceutical, or cheap plastic toys that feel patronizing. Neither treats patients with dignity.
The clinical insight
Alzheimer's prevalence is accelerating
Alzheimer's Association · 2024 Alzheimer's Disease Facts & Figures
18.4 billion hours of invisible labor
Any solution that adds to caregiver burden will fail in practice regardless of how well it works clinically. This shaped every decision in Lumen's design.
Alzheimer's Association · 2024 Alzheimer's Disease Facts & Figures
Reminiscence therapy outcomes across 26 randomized controlled trials
A 2024 meta-analysis of 2,766 participants found consistent, significant improvement across three key outcomes. Standardized mean difference (SMD) measures effect size.
Journal of the American Medical Directors Association · 2024 · 26 RCTs, 2,766 participants
One of the most clinically supported non-pharmaceutical interventions is reminiscence therapy, using familiar sensory triggers like voices, music, and objects to activate long-term memory and slow cognitive decline.
While Alzheimer's patients lose the ability to form new memories, emotional and long-term memories remain accessible far longer. The problem: reminiscence therapy typically requires a caregiver to be physically present.
What if an object could deliver reminiscence therapy passively; without a caregiver in the room?
Would a passive object actually work?
The real question: Is there clinical evidence that a physical object can deliver reminiscence therapy without a facilitator present? The answer is yes, and the research is specific.
Object-based memory access
Neuropsychological research shows that procedural and emotional memories remain accessible even when factual recall is gone. Holding a familiar object can trigger memories even when a patient cannot verbally recall their former occupation. Touch bypasses the verbal memory barriers that Alzheimer's erects first.
Dementia Activities Research · Object-Based Reminiscence Therapy, 2023NIH-funded object validation
NIH-funded research specifically tested physical objects — including 3D-printed personal items — as reminiscence triggers, hypothesizing that object-based reminiscence would outperform verbal cues alone in stimulating memory, cognition, mood, and quality of life. The physical trigger is not incidental — it is the mechanism.
NIH ClinicalTrials.gov · NCT03625973 · 3D Object Reminiscence TherapyAutomated delivery is validated
Researchers at Universitat Politecnica de Catalunya built an AI-based system that automates reminiscence therapy delivery without a therapist present — proving the concept is both technically feasible and clinically grounded. Lumen takes this further: the trigger is passive, tactile, and requires no screen or instruction.
Carós & Radeva · Automatic Reminiscence Therapy for Dementia · arXiv 2019Home-based systems reduce caregiver burden
A 2025 University of Toronto study validated that home-based assistive devices for dementia patients can enhance patient autonomy and dignity while actively alleviating caregiver responsibilities — which is exactly what Lumen's passive delivery model and companion app are designed to do.
Sanchez & Mihailidis · University of Toronto · Alzheimer's & Dementia, 2025The therapy works. Object-based delivery is validated. Passive autonomous delivery is an active research frontier. Lumen sits at the intersection of all three — and adds something none of the existing research has addressed: an object beautiful enough to live on a bedside table.
Two users. One object.
Lumen serves an early-to-moderate stage Alzheimer's patient as the primary user, and their caregiver or family member as the secondary user. Every design decision maps back to one of them.
Still has meaningful daily function but forgets recent events almost immediately. Experiences anxiety when unstimulated or left alone. Reduced grip strength.
Goal: Calm, familiar, grounded Pain: Anxiety when unstimulatedAdult child managing care from a distance. Wants visibility into how her mother is doing without being physically present every day. Already overwhelmed.
Goal: Visibility without hovering Pain: No signal when Mom is having a good dayResearch insight: Patients responded best to familiar voices with personal references. A grandchild saying their name by name was more effective than any generic audio or music track.
A maple wood smart ball
Lumen is a single tactile object the patient keeps with them throughout the day. When held and fidgeted with for 30–60 seconds, it plays short personal voice recordings uploaded by family members.
The ball listens for a response. The interaction is logged. The caregiver gets a quiet notification: Mom had a memory session today.
The Ball
50mm maple wood, warm and smooth to the touch. Three tactile zones guide interaction without any instruction needed.
The Chest
Walnut wood charging case that lives on the bedside table. A beautiful object, not a medical device.
The App
Caregiver-facing companion app for uploading voice recordings and viewing session logs, simple by design, not by accident.
The Data Loop
Session logs sync over WiFi overnight. Caregivers see engagement trends. Clinicians can receive weekly summaries directly from the app.
Every decision was earned
Below are the six decisions with the most design reasoning behind them — shown with the constraint or insight that forced each choice.
Form — why a ball
Baoding balls are a centuries-old practice of rolling two metal balls in one hand to calm the mind. I started with two, then cut to one: at usable size, two balls fill an elderly palm with reduced grip strength. One ball at 50mm delivers the same rhythmic calming effect and is substantially more ergonomic.
Surface — three tactile zones
The ball has three distinct zones: smooth poles, a raised dot cluster at the equator, and carved horizontal grooves in the lower hemisphere. The grooves solve a hidden orientation problem, fingers naturally settle into them, which means the speaker always faces up without any instruction given to the patient.
Audio — distributed port clusters
A single acoustic port at the top gets muffled when a patient cups both hands around the ball, a natural holding posture. Three clusters of 7 drilled holes at 120° intervals ensure at least one port is always exposed, regardless of grip. Visually, they read as a constellation rather than a speaker grille.
Material — maple ball, walnut chest
Maple is smooth, warm to the touch, and takes a fine finish without feeling clinical. The chest is walnut, which is intentionally darker so the ball is easy to locate by contrast when placed inside. Two natural woods that look like they belong on a bedside table, not in a hospital supply room.
Color — sage green accents
Research from the Fisher Center for Alzheimer's Research Foundation shows Alzheimer's patients respond best to soft, muted tones. Sage green (R:158, G:185, B:158) was selected for LED and app accents, clinically calming, reads as intentional design rather than medical device. The terracotta in the app was used sparingly to signal caregiver actions without inducing anxiety.
What's inside a 50mm maple ball
Total electronics cost (prototype): ~$30–40. The constraint of a 50mm wooden sphere with a 34mm usable interior forced every hardware decision. Here's what that looked like in practice.
The first charging approach was Qi wireless induction — it's elegant, invisible, no connectors. But here's the problem:
The constraint forced a better solution. The user experience is identical — set the ball in the chest, it charges — but the hardware is far more compact and manufacturable.
Designed for the caregiver, not the patient
The companion app is intentionally simple — but that simplicity was a design decision, not a shortcut. Caregivers managing a parent with Alzheimer's are already overwhelmed. Every feature that wasn't added was a deliberate choice.
What I omitted — and why
Three pivots that made the product better
✗ Two Baoding-style balls at usable size fills an elderly palm — too demanding for reduced grip strength.
✓ One ball at 50mm provides the same rhythmic calming effect with far less physical demand.
✗ Qi receiver coils are 40–50mm diameter — nearly the full ball size. Not feasible with all other components.
✓ Pogo pins are tiny, reliable, and invisible during use. User experience is identical; hardware is far more compact.
✗ A single acoustic port at the top gets muffled when a patient cups both hands over the ball — the most natural holding posture.
✓ Three clusters at 120° intervals ensure at least one port is always exposed, whatever the grip.
What this project taught me
The best assistive technology disappears
The patient should never feel like they're using a device. Every decision — maple wood, no screen, no buttons, no instructions — was in service of that goal.
Hardware constraints are design constraints
The pogo pin pivot wasn't a compromise — it was a better solution. A 50mm shell forced decisions that made the product simpler, smaller, and more elegant.
Designing for zero UI
This project forced me to think about interaction without a display. Every behavior had to be legible through touch, sound, or physical affordance alone.
Restraint in the app is a feature
Choosing what not to build — no live audio, no scoring, no constant push notifications — was as hard as the decisions I made. The app is simple because trust matters more than dashboards.
v2 Vision
- Passive heart rate sensing through palm contact using optical PPG — no wristband, no patch
- Adaptive memory selection based on time of day, detected stress level, and engagement history
- Subtle warm-glow LED embedded in the wood grain — visible through the maple when active
- Caregiver API for care facilities to aggregate anonymized session data across patients
