This example demonstrates a live counter that updates every second, displaying the number of elapsed seconds in the browser and the console. It uses RxJS’s `Observable.timer` to emit sequential integers, which are mapped to formatted strings. The resulting data stream is subscribed to by two effects: a DOM effect that writes the text into a `#app` container, and a console effect that logs each message. The code separates the main data stream from its side effects, following a simple functional reactive programming pattern.