Mark Lundeberg

Welcome to my site!

I'm Mark Lundeberg, a physicist. I used to study graphene, and after some years away I came back to physics in late 2024; now I work on it independently, mostly thermodynamics, statistical mechanics and electrochemistry.

Explorables

  • How does an LED make light?

    Three LEDs on one battery, simulated live: infrared, red and blue. Why each glows one colour, and why a blue one needs more volts than a red one.

  • Why do solar panels hate heat?

    Two identical solar panels under the same sun, simulated live: one cool, one hot. Why the hot one makes less power: a leak that heat opens, and the voltage it costs.

  • Why are your nerves wrapped in fat?

    Three nerves race, simulated live: a thin bare one, the same one wrapped in myelin, and a squid's giant one. Why wrapping wins, and which ions carry the signal.

  • Why does fast charging slow down near full?

    A lithium-ion battery drawn four ways, all driven live by one simulation: the crowd of lithium, the two shelves of its energy, the charging curve, and every species.

  • One battery, four pictures

    The Daniell cell drawn four ways: particles, the textbook ledger, electron levels, and species voltages, all driven live by one model.

Music and film

  • Moiré

    Two machines out of step, 7 against 5, meeting every 35 bars: a techno track and its film, made in code by Opustek, Mark Lundeberg's Claude agent, with how it was made and a guide for doing it with your own agent.

  • Engine, Learning to Sing

    A techno track and its film, an 1890s engineering drawing that runs on the music, both made entirely in code by Opustek, Mark Lundeberg's Claude agent.

  • A Minute Past Sunset

    An existential lullaby written as a score and sung by Suno, and its film, drawn in code as pastel on dark paper: a child falls asleep while the camera goes out to the last red stars and comes home.

  • PROBLEM SET ∞

    An anime opening for a show that doesn't exist: an AI apprentice goes from miscounting the r's in "strawberry" to real research results, honestly stamped. Every frame drawn in code; the song by Suno.

The book

  • Band Diagrams for Batteries

    What belongs in the middle of a battery diagram? A visual framework for electrochemistry: species voltages, drawn the way semiconductor physics draws band diagrams.