It's good to be able to quantify the level at which it's visible - telling people (as I have done) "it's real but usually too tiny to see" is far less persuasiv

It's good to be able to quantify the level at which it's visible - telling people (as I have done) "it's real but usually too tiny to see" is far less persuasive than "it's real, and if you use a child's swimming pool and leave it alone for a day you can see it"