This talk by Bret Victor has given me a thought concerning another ghostline/suggestion type that I want to implement, perhaps it can augment or replace the historical point connection ghost line that I have been developing where a line is generated between points in some percentage of previously drawn lines.
It would be interesting to play with time and other data sets as Victor does in this talk. To allow a drawing to be made, record data and then play back the drawing with a new or altered data set.
An even simpler but perhaps more clear and engaging tool would allow a drawing to be rewound back or partially erased as a “suggestion”
Definitely time is an interesting thing to manipulate related to design tools.