For example, I've made a ton of short videos where folks can see how I use my new invention. The videos also show and explain how to hold it and where to hold it. The Machine starts with your garden variety fidget spinner.
Despite the visuals and the audio explanations, people are repeatedly asking me how to use the spinning unit which is fidget spinner with ceramics attached.
I showed a friend one of the newer models while eating lunch. She saw the thing on the table sitting in front of her for 30 minutes. It has a white ceramic rings on both sides of the unit. Tonight on the phone she couldn't figure out what I was referring to when I talked about the white rings. She said she couldn't picture it even though she keeps asking me about getting one (for free.)
She has held and spun the units.
Meanwhile she was very impressed with the way it looks and she wants one. So it's not as if she wasn't paying attention to what the units look like.