I am puzzled. They mention velcro doesn't work with rigid surfaces, but when they show a picture of what I assume is their solution, it seems to utilise ... "a flexible sheet material", i.e. a non-rigid surface.
I am puzzled. They mention velcro doesn't work with rigid surfaces, but when they show a picture of what I assume is their solution, it seems to utilise ... "a flexible sheet material", i.e. a non-rigid surface.
Why are you puzzled? "Doesn't work with rigid surfaces" shows it working with a non rigid surface. Of course what the article says is a true system didn't work with a rigid surface, but they came up with something close.
Then the logical conclusion is that they meant that velcro doesn't work when at least one of the surfaces is rigid.
Perhaps the flexible sheet is just used so it can be peeled back to reveal the mechanics of the connecting bits--perhaps the flexibility is purely pedagogical.