You know those nice grooves or indentions in the back of soap bars? It looks like a scoop has been taken out, but it actually makes it look a little nicer?
Well, the main reason soap has that scoop taken out of the back is that it saves money. Yep, you can save 15% of the raw materials costs on soap when you scoop out the back.
With this little fact in mind, I chuckled when I saw the soap in my hotel bathroom. Check it out. Looks like they are saving more than 15%. :)