9 Epilogue

"Before I had studied Chan (Zen) for thirty years, I saw mountains as mountains, and rivers as rivers. When I arrived at a more intimate knowledge, I came to the point where I saw that mountains are not mountains, and rivers are not rivers. But now that I have got its very substance I am at rest. For it’s just that I see mountains once again as mountains, and rivers once again as rivers"

–Buddhist saying originally formulated by Qingyuan Weixin, later translated by D.T. Suzuki in his Essays in Zen Buddhism.

Translated into Racket:

(dynamic-wind (lambda ()

(and (eq? 'mountains 'mountains)

(eq? 'rivers 'rivers)))

(lambda ()

(not (and (eq? 'mountains 'mountains)

(eq? 'rivers 'rivers))))

(lambda ()

(and (eq? 'mountains 'mountains)

(eq? 'rivers 'rivers))))