Breathing is an exchange of gases

An idea for a poster, from July 2022.

Someone said the phrase “Breathing is an exchange of gases” in a video call, and I was inspired. (I wish I could remember who said it, but I can’t.)

The photo is by Chris Leipelt on Unsplash.

A moody black and white landscape with hills and valleys filled with mist; the words 'Breathing is an exchange of gases' in white text near the bottom

You can download a PDF if you like