Imagine a time, set so far in the future... A time when Humans have left Earth to explore, and settled throughout the Galaxy, a time where the idea that mankind ever only inhabited ONE planet, is thought to be an old wives tale.
Foundation is just that. The foundation for all other sci-fi adventures. So many books and films have followed in the steps of Foundation, and Asimov really has lead the way for people to let their imagination run riot and imagine what on the one hand, is so far fetched, but on the other leaves us wondering "well maybe..."
Everything in Foundation has a sort of logic, the theory that the future can be mapped out by mathematical equations. However even in the future, ideas can be thought of as heretic, and people with ideas that do not fit in with the norm, are cast away, to the edge of space where they can cause no trouble.
Foundation, and the following classics will stretch your imagination and throw you into a World of 'fantasy' that seems to have a lifeline to reality. Considering the Foundation series of Asimovs books were written so long ago, they are still fresh enough, and still have an edge to hold onto the reader until the very last page.