Once there were two friends, a Zen master and a Professor, who wanted to climb a very tall mountain. They both set out at the foot of the mountain. The Prof came with all his gear and instruments to find the most optimal path. The Zen master came with his walking stick. They said goodbye and wished to see each other at the top. After 28 days, the Professor reached the top. He found his friend resting in the shade of a tree: 'How did you get here?' he asked. The Zen master replied 'Are we at the top? already? ... I got lost, stopped looking and fell asleep under this tree.'