This visualization compares monthly stock price data for several companies across multiple years. It initially renders as a stacked bar chart where each bar represents a company and is subdivided by year, using D3 v4’s stack layout and ordinal color scale. Clicking anywhere on the page triggers a smooth transition: the grouped bars slide into separate columns and reshape into individual bars showing each company’s average yearly price, animated over 800 milliseconds. The SVG-based transition highlights how the data can be viewed either as cumulative contributions or as independent annual values.