1.5 marble run research

https://en.wikipedia.org/wiki/Rolling_ball_sculpture

https://iopscience.iop.org/article/10.1088/1755-1315/459/3/032085/meta

https://www.jstor.org/stable/3332623?seq=1#metadata_info_tab_contents

http://www.designishistory.com/1850/dada/

https://www.invaluable.com/blog/kinetic-art/

https://themadmuseum.co.uk/history-of-kinetic-art/

https://www.theartstory.org/movement/kinetic-art/

https://www.tate.org.uk/art/art-terms/k/kinetic-art