This is the only “Trackball Mouse” I know of: https://commons.wikimedia.org/wiki/File:Apple_Mighty_Mouse_Wireless_in_perspective.jpg https://commons.wikimedia.o

This is the only “Trackball Mouse” I know of: https://commons.wikimedia.org/wiki/File:Apple_Mighty_Mouse_Wireless_in_perspective.jpg https://commons.wikimedia.org/wiki/File:Apple_Mighty_Mouse_W... It's a pretty small trackball.