For the height-challenged among us, it can be tough to see all the way to the back of a high shelf or cabinet. Considering this, these Amazon lockers have had a thoughtful touch added to them, to make sure you don’t leave any unseen objects behind:
Mirrors, brilliant. After seeing this, I’m thinking about getting my hands on some lightweight Plexi mirrors, cutting them to size and doing this to the cabinets in my kitchen.
https://www.core77.com/posts/92225/Good-Design-A-Simple-Detail-That-Lets-You-See-All-the-Way-to-the-Back-of-a-Tall-Shelf-or-Cabinet-Interior