With the help of photography, we can see what a ‘retrograde’ motion looks like. This astrophotographer has recorded two planets during late 2015 and most of 2016. The link to the photo is here: Retrograde Motions of Saturn and Mars 2016
Mars has a retrograde motion every other year. Saturn, yearly.
If you like this kind of photography, Mr. Tezel has over 300 images on the The World At Night (TWAN) site. Here is his collection: Photo Gallery of Tunc Tezel
Trust you will enjoy his work.