"The world exists but it is not real...

...what do you think about that?

...Ku* is existence without noumenon. It exists but it doesn't exist. There is no substance. I exist, but what does that mean? Is this me, my head, my feet, my skin? No. My cells, body, skin are changing all the time. Every seven years all the cells in our body are completely renewed. Where is me? It's the same for everything in the world, and for the world itself; it has no noumenon, it is ku*."

Taisen Deshimaru Roshi (1914-1982) ABZenD: 180 answers about zen from Master Deshimaru

*Ku - (Japanese) "Emptiness;" ...It is the emptiness of emptiness, it is the emptiness of the circumstances of any situation, and it is the emptiness of yourself.....