{
    "$schema": "https://vega.github.io/schema/vega-lite/v4.json",
    "columns": 4,
    "concat": [
        {
            "mark": {
                "filled": true,
                "shape": "circle",
                "size": 400,
                "stroke": "black",
                "strokeWidth": 0.5,
                "type": "point"
            }
        },
        {
            "mark": {
                "filled": true,
                "shape": "square",
                "size": 400,
                "stroke": "black",
                "strokeWidth": 0.5,
                "type": "point"
            }
        },
        {
            "mark": {
                "filled": true,
                "shape": "diamond",
                "size": 400,
                "stroke": "black",
                "strokeWidth": 0.5,
                "type": "point"
            }
        },
        {
            "mark": {
                "filled": true,
                "shape": "cross",
                "size": 400,
                "stroke": "black",
                "strokeWidth": 0.5,
                "type": "point"
            }
        },
        {
            "mark": {
                "filled": true,
                "shape": "triangle-up",
                "size": 400,
                "stroke": "black",
                "strokeWidth": 0.5,
                "type": "point"
            }
        },
        {
            "mark": {
                "filled": true,
                "shape": "triangle-down",
                "size": 400,
                "stroke": "black",
                "strokeWidth": 0.5,
                "type": "point"
            }
        },
        {
            "mark": {
                "filled": true,
                "shape": "triangle-left",
                "size": 400,
                "stroke": "black",
                "strokeWidth": 0.5,
                "type": "point"
            }
        },
        {
            "mark": {
                "filled": true,
                "shape": "triangle-right",
                "size": 400,
                "stroke": "black",
                "strokeWidth": 0.5,
                "type": "point"
            }
        },
        {
            "mark": {
                "filled": true,
                "shape": "triangle",
                "size": 400,
                "stroke": "black",
                "strokeWidth": 0.5,
                "type": "point"
            }
        },
        {
            "mark": {
                "filled": true,
                "shape": "arrow",
                "size": 400,
                "stroke": "black",
                "strokeWidth": 0.5,
                "type": "point"
            }
        },
        {
            "mark": {
                "filled": true,
                "shape": "wedge",
                "size": 400,
                "stroke": "black",
                "strokeWidth": 0.5,
                "type": "point"
            }
        },
        {
            "mark": {
                "filled": true,
                "shape": "stroke",
                "size": 400,
                "stroke": "black",
                "strokeWidth": 0.5,
                "type": "point"
            }
        },
        {
            "mark": {
                "filled": true,
                "shape": "M -1 -1 L 1 1",
                "size": 400,
                "stroke": "black",
                "strokeWidth": 0.5,
                "type": "point"
            }
        }
    ],
    "data": {
        "values": [
            {
                "x": 0
            }
        ]
    }
}