I read the following article on kurzweilai.net:

http://www.kurzweilai.net/forums/topic/death-defying-time-crystal-could-outlast-the-universe

So, what do you think? Could the heat-death of our universe have already happened and we are living inside a time crystal right now? Or is this structure indeed only capable to repeat our thought processes over and over again and our memories are modified so that we don't notice this? Would such a modification be even possible inside this structure? And what are the limits of the simulational capabilities of a time crystal? Could we detect that we are living in one?