Toddler Activity: Ordering Rings According to Size

I got this idea from I Can Do It! I Can Do It! by La Britta Gilbert (She's not a Montessorian, but definitely Montessori-inspired) but instead of using metal key rings, I used these thrifted hoops. I know that it would be better with one more hoop :)

Some other sorting ideas that I'm gleaming from her other book, Do Touch are the following:

• sorting measuring spoons according to size
• sorting objects according to the kind of material they're made of
• sorting strips of lace patterns
• sorting hardware of matching sizes
• sorting squares of sandpaper
• (my favorite) sorting between objects with corners/no corners

The sad thing? I actually had these books recommended by Starry Sky Ranch since I was pregnant with Cheeky and had all these lofty notions that I would do them with Koko while Cheeky was asleep and I don't think I did a single activity.