The interviewer describes physical constraints as potentially consisting of the laws of physics and mental constraints as knowledge already acquired.

“that we should be building knowledge and constraints into the system he thinks that we should just scale you know models of computation and I'm a big believer that constraints are incredibly valuable and by constraints you know more broadly I'm just talking about knowledge I think constraints happen at multiple levels of abstraction so in the physical world constraints might just be the laws of physics or whatever and and in our minds the constraints might be things that we already know and this guy Chris the other day he was saying to me that one of the amazing”