da Vinci & Stevens

No human investigation can be called real knowledge if it does not pass through mathematical demonstrations; and if you say that the kinds of knowledge that begin and end in the mind have any value as truth, this cannot be conceded, but rather must be denied for many reasons, and first of all because in such mental discussions there is no experimentation, without which nothing provides certainity of itself.

                                                                                      Leonardo da Vinci

All poetry is experimental poetry.

                                                                                      Wallace Stevens