This visualization combines a vertical histogram and two event-sequence views to explore event timelines over time. The histogram, built with `d3.histogram`, `d3.brushY`, and time scales, displays the distribution of event counts per hour, and allows brushing to filter sequences. The compact view and the larger sequence view, both rendered as SVG rectangles using `d3.hierarchy`, show hierarchical event details from CSV data, with the brushed date range controlling which sequences are displayed.