Well, Father Ernetti of Venice would certainly have agreed with you.
Furthermore, he claimed he HAD one: the Chronovisor.
While the book about his purported device is infuriatingly... infuriating, and the "pictures" are obviously a fraud (so obviously, in fact, that they are rather intriguing...) the idea is quite fetching.
But, and I hate to disappoint you, we already have a "chronovisor" in-built in each and every one of us.
All we have to do is use it.
[edit on 28-3-2008 by Vanitas]

