One day, Goldilocks was using her tablet to search for wolf repellent for her friend Little Red Riding Hood. Suddenly, a huge advertisement took over the entire screen. It was annoying and she had to stop what she was doing to make it go away. Too big, said Goldilocks and she continued to search.
Next, a tiny banner ad appeared at the very top of her tablet. She didn’t even notice it which is a shame because it was an ad for Talbot Brothers Wolf Repelling Capes. Too small.
Finally, a 300 x 250 medium rectangle ad appeared next to an article about cottage rental through Airbnb. Ah ha! It was just what she was looking for. Not too big. Not to small. That medium rectangle was just right! She clicked it and bought the gift for Little Red.