A sea shell ?
I've not come across anything like that before , if it kind of  yeah and that opens out into your flip-top.
Yeah.
Then it's nice t to h you can make it lightweight plastic , nice to hold in the palm of the hand and just because you're having to actually insert in between the two covers , that's gonna take care of some of the repetitive strain injury trying p prevent a lot of that I would think. I think it's a really nice idea