function BooleanVis(canvas) {
              var width = 1000;
              var height = 800;

              // var color = d3.scale.category20();
              var color = d3.scale.linear().domain([-1, 0]).range(['white', 'red']);
              var scale = d3.scale.linear().domain([-3, 3]).range([0, 255]);
              var startTime = Date.now();

              // Duration 4:06
              var chanceOfBinary = d3.scale.linear().domain([startTime, startTime + 135000, startTime + 222000, startTime + 223000, startTime + 300000]).range([0, 0, 1, 1, 1]).clamp(true);
              var numCirclesScale = d3.scale.linear().domain([startTime, startTime + 135000, startTime + 222000, startTime + 223000, startTime + 300000]).range([0, 0, 5, 0, 0]).clamp(true);
              var textScale = d3.scale.linear().domain([startTime, startTime + 135000, startTime + 235000, startTime + 300000]).range([0, 0, 100, 100]).clamp(true);

              
              this.color = d3.scale.category20b();
              this.scale = d3.scale.linear().domain([-3, 6]).range([1000, 0]);
              this.indexScale = d3.scale.threshold().domain([0, 54000, 70000, 84000, 120000, 154000, 167000, 200000, 230000]).range([0, 3, 10, 40, 10, 1, 60, 20, 10, 10]);

              var ctx = canvas.getContext('2d');
              
              ctx.fillStyle = "rgb(0,0,0)";
              ctx.fillRect(0, 0, this.width, this.height);

              // poll()
              this.poll = function() {
                var me = this;
                d3.json('/playbackServer/api/data.json', function(err,json){me.draw(err,json);});
              };
              
              this.draw = function(json) {
                if(json === undefined) return;

                var data = getDataOfSkeleton(json, 0);
                // console.log(data);
                // data = data.slice(0, 8);

                ctx.fillStyle = "rgba(0, 0, 0, 0.1)";
                ctx.fillRect(0, 0, width, height);

                // ctx.font = '15px sans-serif';

                var t = Date.now();

                var threshold = numCirclesScale(t);

                _.each(data, function(d, index) {
                  // console.log(index);

                  if(index > threshold)
                    return;

                  var drawAsBinary = Math.random() < chanceOfBinary(t);
                  if(drawAsBinary) {

                    var fontSize = Math.random() * textScale(t) + 8;
                    ctx.font = 'bold ' + fontSize + 'px sans-serif';

                    var binary = Math.round(scale(d)).toString(2);
                    _.each(binary, function(bit) {
                      var x = Math.random() * width;
                      var y = Math.random() * height;
                      ctx.fillStyle = bit === '1' ? 'red' : 'white';

                      ctx.fillText(bit, x, y);
                    });
                  } else {
                    var x = Math.random() * width;
                    var y = Math.random() * height;
                    ctx.fillStyle = color(d);

                    drawCircle(ctx, x, y, 4);
                  }
                });
              };
            };

            // You can choose one of these to visualise a different dance
            var DATASET_ALGORITHM = 'https://d10u56tzn9e9rq.cloudfront.net/algorithm_';

            var DATASET_BINARY = 'https://d10u56tzn9e9rq.cloudfront.net/binary_';

            var DATASET_WHOLEPIECE = 'https://d10u56tzn9e9rq.cloudfront.net/wholepiece_';

            var dataFetcher = new ChunkedDataFetcher(DATASET_ALGORITHM);
            var boolean = new BooleanVis( document.getElementById('mycanvas'));
            dataFetcher.drawFunction = function(json) {boolean.draw(json);
            }