SizzlinShred
A school of the seven liberal arts

Learn it.
Prove it.

An education that forms judgment and expression: understand what is true, weigh what is claimed, and say it so others can test it. The seven liberal arts stay at the centre, carried into today's knowledge and back to the teachers who explained them.

Start your first lesson Explore the library

The Daily Shred · today

A three-minute challenge

A new one every day, the same for everyone, rotating through the wings.

One rest day a week never breaks a streak.

Play today's challenge
The path

Levels 1 to 1000

A thousand levels of about ten hours each, from reading one short poem slowly to a body of original work defended in the open.

Every level asks for some of five acts. The five-part form is the site's own synthesis, not a medieval scheme:

  1. Grammar Understand exactly.
  2. Dialectic Examine the reasons.
  3. Rhetoric Express it truly.
  4. Inquiry Check it against evidence.
  5. Judgment Act and review.
Start at Level 1 See all thousand levels
Start here

What do you want to get better at?

Pick one. Five steps across the site, ending with something to try.

  1. Think clearlyHow do I stop fooling myself?
    See the 5 steps
    1. Peirce on the Fixation of Belief
    2. Observe, Define, Represent
    3. Hypotheses, Predictions and Tests
    4. The Elenchus
    5. Judgment Under Uncertainty
    Start the trail →
  2. Play guitarHow do I get better at guitar, not just busier?
    See the 5 steps
    1. Tuner
    2. The guitar Path
    3. The Daily Ritual
    4. Deliberate Practice
    5. Pure vs tempered ratios
    Start the trail →
  3. Eat and train smarterWhat actually works for food, strength and health, and how would I know?
    See the 5 steps
    1. Health and Nutrition Orientation
    2. Reading Nutrition Evidence
    3. Plant-Based Eating Framework
    4. Protein for Muscle on a Plant-Based Diet
    5. Recovery-Based Strength Training
    Start the trail →
  4. Build and fix thingsHow do I find what is really wrong, and build things that keep working?
    See the 5 steps
    1. Philosopher-Engineer
    2. Evidence-Based Troubleshooting
    3. Quantitative Reasoning
    4. Systems Thinking
    5. Working with Coding Agents
    Start the trail →
  5. Read great booksHow do I read a difficult classic and come away with something?
    See the 5 steps
    1. Reading Great Books
    2. Seven Liberal Arts, Hands-On
    3. Peirce on the Fixation of Belief
    4. Knowledge and Justified Belief
    5. The Canon
    Start the trail →
The curriculum

The seven liberal arts

The three arts of language, the Trivium, form how you understand, reason and speak. The four arts of quantity, the Quadrivium, form how you prove and measure. Each runs in three rounds, from foundations to mastery, with checks you can pass and tasks you can show.

ArtCentral concern
Trivium the arts of language
GrammarGrammatica Understanding language, its structure, and meaning
Logic or dialecticDialectica Definitions, inference, arguments, and objections
RhetoricRhetorica Clear, effective expression suited to an audience
Quadrivium the arts of quantity
ArithmeticArithmetica Number and its properties
GeometryGeometria Magnitude, spatial relationships, and demonstration
MusicMusica Numerical relationships and harmony
AstronomyAstronomia Mathematical order and celestial motion

Open the curriculum Swipe the seven arts

Do before you read

Hear a ratio.

A classic demonstration links number and sound: pleasing intervals come from simple whole-number ratios of string length, a discovery traditionally credited to the Pythagoreans. Press a button to hear two tones in that ratio together.

Both tones start on A3 (220 Hz). You hear the ratio itself, built from pure tones.

More at the Science page →
Guitar, today

Thirty minutes. Four blocks.

  1. 00–05 Monochord warm-up. C major up and down one string, one finger.
  2. 05–15 Interval study. Diatonic 6ths on the G and high E strings.
  3. 15–25 Triad pairs. C and D triads over a C drone (Lydian).
  4. 25–30 3 against 4. Accent every third eighth note.
Start the timer
Sentence of the day
We learn not for life but for school.
Seneca, Epistulae Morales 106.12 Attested A complaint, not a motto: Seneca is attacking education that produces cleverness rather than conduct. Browse the canon →
The whole map

Every wing, one map.

Each wing stands on its own, but the links between them are the point: the habit that checks a proof is the habit that tests a nutrition claim and the habit that troubleshoots a network.

  1. 28 pages

    Liberal Arts & Reasoning

    Liberal Arts and Reasoning is the part of the library about how to think well, read deeply and judge wisely.

    Enter →
  2. Interactive

    Logic & Proof

    Definitions, Euclid's postulates, fifteen propositions proved step by step, Plato's Divided Line and a Socratic cross-examination you can run on your own beliefs.

    Enter →
  3. 17 pages

    Mathematics, Systems & Languages

    Mathematics, Systems and Languages is the wing for learning to think precisely and say it well.

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  4. Interactive

    The Geometry Lab

    Geometry, the art of magnitude at rest, made hands-on: tilt a plane through one cone to cut all three curves, as Apollonius did in the Conics; see each curve by its area property; send light from a focus; and let one number, the eccentricity, sort them all, from the Earth's nearly circular orbit to a comet's open path.

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  5. Interactive

    The Science of Sound

    Where number becomes something you can hear: pure and tempered intervals, beats, the Pythagorean comma, the harmonic series and the physics of strings.

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  6. Interactive

    The Astronomy Lab

    Astronomy, the art of magnitude in motion, made hands-on: why the seasons come from the Earth's tilt, how the Moon's phases work, how Eratosthenes measured the Earth with a shadow, why Mars seems to go backwards, and Kepler's laws checked against real planetary data.

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  7. Interactive

    Music & Guitar

    Guitar practised like an experiment: one string, then two, then the whole neck, a 30-minute daily ritual, and working instruments: tuner, metronome, drone, fretboard and monochord.

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  8. 12 pages

    Health & Nutrition

    The Health and Nutrition wing treats the body as the instrument every other study depends on.

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  9. 11 pages

    Engineering & Career

    Engineering and Career is the wing where the liberal arts meet working practice.

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  10. Interactive

    The Canon

    Sixty-seven sentences worth knowing, from the Presocratics to the present, each cited to its source and graded for how reliable the attribution is.

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