The Cost of a Glance

02 · DEEP WORK — FOCUS IS THE SCARCE RESOURCE the ability to concentrate without distraction is getting RARER and more VALUABLE at once. a 'quick glance' at your phone costs far more than the glance — here's why. two kinds of work DEEP WORK focus on a cognitively demanding task. hard, high-value, rare. produces anything worthwhile. SHALLOW WORK email, chat, admin, reactive. easy, feels productive, nearly worthless — and it CROWDS OUT the deep. attention residue — switching leaves part of your mind STUCK on the last task deep task A glance 📱 back to A (reduced) residue from A (and the phone) stays stuck → you run at reduced capacity. refocusing fully can take ~20 MIN. 'multitasking' is a MYTH — it's rapid switching, paying a residue tax every time. = a CPU CONTEXT SWITCH (HCW L08) each switch saves & reloads working-memory context. switch too often → you spend cognition on the OVERHEAD (thrashing). single-task = cache locality. the economics — why more HOURS isn't the answer valuable output = (time spent) × (INTENSITY of focus) the terms MULTIPLY: 4 hrs of true focus beat 12 fractured ones. most people raise TIME and destroy INTENSITY. fragmentation caps intensity → caps output, no matter the hours. FLOW = peak intensity complete absorption. needs an UNBROKEN block, a clear goal, challenge matched to skill (the edge, L01). you cannot flow in 5-minute fragments. protect it — & know your attention is being SOLD THE DEFENSE (structural, not willpower) time-block for depth (60–90 min, guarded) · batch the shallow into windows · KILL THE CUES (phone away, notifications off) not just the urge · single-task · ritual + environment · train it like a muscle. THE ATTENTION ECONOMY feeds & notifications are ENGINEERED habit loops (cue→ check→novelty). your focus is the product sold to advertisers. your distraction is designed — not a personal failing. → L03 THROUGHLINE focus is the scarce input to all hard work. attention residue makes task-switching costly (the same overhead as a CPU context switch; ~20 min to refocus), so output = time × INTENSITY, and fragmentation caps intensity no matter the hours. much of it is engineered by an attention economy selling your glances. defend it structurally: block, batch, kill cues, single-task, train. it's the resource that makes deep work — and therefore deliberate practice (L01) — possible. JARGON: deep vs shallow work · attention residue · context switch · single-tasking · flow · time-blocking · cue removal · the attention economy