The Science of Deduction
The Science of Deduction Five rooms · Everything is reasoned from what you show it

A consulting detective's method, turned on the visitor

You have been in a distant country, I perceive.

So Holmes greeted Watson in A Study in Scarlet. This page does the same to you, from your clock, your screen and your hands. Then it hands you the lens: read a stranger, submit an object of your own, and test yourself against the monographs.

The Examination

Your browser has been giving evidence since you arrived. Two short trials add what your hands reveal. Then I reason. Nothing here leaves this page.

i

Passive observation

Under way

Your clock, your screen, your machine, your habits of scrolling and wandering off. Recorded in the ledger as they happen.

ii

The typewriter

Not taken

Type the line below as written. Speed, corrections and fidelity all count as evidence.

Data! Data! Data! I can't make bricks without clay.The Adventure of the Copper Beeches
0 wpm0 corrections– exact
iii

The lamp

Not taken

Press the lamp to begin. When it flares, press it again at once. Three rounds.

Round 1 · –Round 2 · –Round 3 · –
Skip any trial you like. I will reason with less.