Is no clues a clue?

A great game that Dad and I would sometimes play on Sundays was Reconnaissance Expedition. Sometimes the Reconnaissance Expeditions were extremely simple, like when he told me to bring back something from every decade in the twentieth century – I was clever and brought back a rock – and sometimes they were incredibly complicated and would go on for a couple of weeks. For the last one we ever did, which never finished, he gave me a map of Central Park. I said, 'And?' And he said, 'And what?' I said, 'What are the clues?'
He said, 'Who said there had to be clues?'
'There are always clues.'
'That doesn't, in itself, suggest anything.'
'Not a single clue?' He said, 'Unless no clues is a clue.'
'Is no clues a clue?' He shrugged his shoulders, like he had no idea what I was talking about. I loved that.

Currently reading to Extremely Loud and Incredibly Close - Jonathan Safran Foer. aand, so far, this is my favorite part. wish I can read for more pages, but sadly I have class tomorrow at 7 a.m., so I post this on blog then go to sleep.
good night everyone, have a good week, good Monday :)