I think the best use case is when you need to present the same icons scaled to different sizes. The one that comes to mind is a web based file manager with dif

I think the best use case is when you need to present the same icons scaled to different sizes. The one that comes to mind is a web based file manager with different views (small icons, large icons, details with icons, etc). OT, but it sort of reminds me of drawing xbm icons in the early days of the web.