Light guided lab · synthetic mechanics

Volume-Imbalance Bars

Choose a scenario, step through trades, and explain why the frozen signed-share boundary closes a bar—or why validation rejects the tape before state changes.

Derived signed-share state

Secondary overlay · computed from synthetic trades; not order-book depth or observed aggressor flow.
Preview
Cumulative signed shares and frozen thresholdThe purple path is cumulative tick-signed shares inside the forming bar. Gold lines show positive and negative frozen thresholds. Green vertical markers show completed bars.
derived signed sharesfrozen thresholdsbar close

What to notice now

The canonical preview is already populated. Step forward and watch the threshold remain fixed until a close.

Compact audit trace

TradeTimePriceSharesSignSignedCumulativeThresholdDecision

Keyboard: Right Arrow = Step, Left Arrow = Back, Space = Play/Pause, R = Reset. Reset is deterministic. With reduced motion, Play advances one meaningful step.