I recently came to know of the following which others might also find useful;

1) Math Made Visual: Creating Images for Understanding Mathematics by Claudi Alsina and Roger Nelsen - https://bookstore.ams.org/CLRM/28

2) Roger Nelsen has also written other similar works like the Proofs without Words(3-vols), Nuggets of Number Theory: A Visual Approach, Cameos For Calculus: Visualization In The First-year Course, etc. - https://bookstore.ams.org/browse?Author=%22Roger%20B.%20Nels...