“Is there such a thing as an invisible animal?⁠ ⁠… In the sea, yes. Thousands⁠—millions. All the larvae, all the little nauplii and tornarias, all the microscopic things, the jellyfish. In the sea there are more things invisible than visible! I never thought of that before. And in the ponds too! All those little pond life things⁠—specks of colourless translucent jelly! But in air? No!

“It can’t be.

“But after all⁠—why not?

“If a man was made of glass he would still be visible.”