Here are some key quotes:
"In 2012, Johnstone created "I had a black dog", a whimsical five-minute video about depression, for the World Health Organisation. He has also written and illustrated books about depression, meditation and the practice of mindfulness, which he describes as "being more aware of what you're doing and [being] more present".
Johnstone now works as creative director at the mental health organisation Black Dog Institute and says mindfulness played a key part in his recovery from depression. (For more about the growing body of evidence that mindfulness can be helpful in managing mental illnesses, see Meditation: the healing force of a quiet mind.)
...a mobile phone camera is the perfect tool for an "eyes-wide-open" meditation on the go. And the beauty of using your phone camera is you probably have it with you all the time. (Just make sure you switch it to aeroplane mode first so you're not distracted by texts, tweets and the like, he says.)
"A camera in your hands is the reminder to consciously slow everything down from your breath, to your walk, to your thoughts... To take photographs, we have to stop, look around, focus and capture. It brings our awareness to what's going on [here and now]."
When we do this, we start to realise we're often surrounded by "beautiful light, beautiful shapes, beautiful colours. But all too often, we just pass them by".
"It doesn't matter what the photograph is, the important thing is the process.""