Thermodynamic cycles leap from chalkboard to roaring machines in four panels

2x2 grid, 16:9, do this for 4 AI picked topics: :root {
    --subject: "$cyclic heat engine or refrigerator"; /* e.g. Stirling engine, Vapor-compression fridge, Steam locomotive, Gas turbine */
    --representation: "PV diagram to running machine";
}

# canvas {
    background: # 1a1f2e;
}

# subject_render {
    mask-image: none;
    render-left-side: "Pure thermodynamics: PV and TS diagrams with cycle overlaid, Carnot efficiency equation, enthalpy change callouts, isentropic efficiency arrow, exergy destruction terms, all in chalk on a blackboard.";
    render-center: "The working fluid evolving: animated piston/cylinder indicating phase, temperature-entropy path glowing, refrigerant phase change in tube with bubble visualization, regeneration matrix, compressor blade profiles with velocity triangles.";
    render-right-side: "Photoreal physical machine: Stirling engine with polished brass and actual flame, refrigerator compressor with copper tubing and frost, steam locomotive with soot and steam blast, gas turbine with running lights and heat shimmer.";
    transition-zone: "The isotherm on the diagram becoming actual piston displacement. The entropy change ΔS turning into waste heat glow on cooling fins.";
}