These figures were created under the direction of Pearson (pearson.com) to accompany Thomas' Calculus and subsequent titles.
In particular, these figures are prominently featured in Pearson's [b]Interactive Calculus[/b] https://www.pearson.com/en-us/subject-catalog/p/interactive-calculus-early-transcendentals-single-variable.
Figures were authored by Tim Brzezinski, Kevin Hopkins, Steve Phelps, and Marc Renault (in 2016) and by Marc Renault (since 2019). These figures are free and open for all to use and enjoy. Questions? Corrections? Fan letters? Contact Marc Renault msrenault@ship.edu.