{ "$schema": "https://vega.github.io/schema/vega-lite/v4.json", "description": "Select multiple points with the shift key.", "data": {"url": "data/cars.json"}, "selection": { "paintbrush": { "type": "multi", "on": "mouseover", "nearest": true } }, "mark": "circle", "encoding": { "x": {"field": "Horsepower", "type": "quantitative"}, "y": {"field": "Miles_per_Gallon", "type": "quantitative"}, "color": { "condition": { "selection": "paintbrush", "field": "Cylinders", "type": "ordinal" }, "value": "grey" }, "size": {"value": 75} }}