Salman Khan

All mental hygiene is based on the core practice of doing nothing. Most of us are good at wasting time, staring at the wall while telling ourselves we should be working. We call this doing nothing, but our brains are furiously active. We think constantly, and our thinking is often rife with distress.

In our gliding experiments we had had a number of experiences in which we had landed upon one wing, but the crushing of the wing had absorbed the shock, so that we were not uneasy about the motor in case of a landing of that kind.

In Holland, we have a saying: 'A knife cuts on two sides.' With the rubber duck, I'm trying to show people what they haven't been seeing in their public space. When the rubber duck is there and when it's gone, you know.