This visualization shows the number of Dutch people vacationing in the Netherlands per quarter, comparing 2019 data with 2020 (the Corona year) via an interactive checkbox. D3 v6 renders animated SVG bars that grow from the baseline when switching between years, using `d3.scaleLinear` and `d3.scaleBand` for axes. The data comes from a GitHub-hosted CBS JSON endpoint, with all bars transitioning smoothly over two seconds via D3's `.transition()` method.