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Three sketches you can poke.

Tiny original canvas labs. They are intuition pumps, not research code. Pair them with the book chapters they sit beside.

1. Differential-drive unicycle

Left and right wheel speeds. Equal speeds go straight; a difference curves. This is the mobile-robot workhorse from the kinematics lesson.

2. One-dimensional Kalman intuition

A hidden motion, noisy measurements, and an estimate that trusts the model or the sensor depending on Q and R. The amber band is roughly two standard deviations. Pair with error propagation and localization.

3. Grid A* sketch

Green is start, amber is goal, dark cells are walls. Click modes below, then paint. The search flood is olive; the path is the amber polyline. Pair with the path-planning lesson.

Related lessons: kinematics, error, planning.