An interactive multi-bar chart displays synthetic stream data across time, with controls for filtering by year, month, week, and zoom level. The visualization uses the NVD3 library’s `multiBarChart` model with D3.js v3 for rendering and transitions. Sidebar selectors and buttons adjust the view, while radio buttons switch between yearly, monthly, weekly, and daily granularity. Data is generated dynamically via custom `stream_layers` and `stream_waves` functions, producing three random series with bump-based distributions.