Usually, data is visually represented through a chart using locations in the image (height, width, and depth). Going beyond three dimensions, we need to make use of other visual cues to add more information. Some of the most common are:
- Color: A visually appealing and intuitive way to depict both continuous and categorical data.
- Size: Marker size is also used to represent continuous data. Could be applied for categorical data as well, but since size differences are more difficult to detect than color, it is not the most appropriate choice for this type of data.
- Shape: Lastly, we have shapes, which are an effective way to represent different classes.