If we engage in artmaking as research we use art to explore and express our experience of the world. It is personal research, not quantitative research. But, like scientific research, it makes knowledge available which can be understood.
This image below is immediately known to us. The art making is the research subject and object, but the meaning of the research varies from person to person. The experience is subjective because art is subjective. Art is good at researching subjective things.
A very good video about art as research. At the beginning, Andrew talks about his research living in the liminal spaces between things, here, between art and science.