In the beginning was the Tao. The Tao gave birth to Space and Time.
Therefore, Space and Time are the Yin and Yang of programming.

        Programmers that do not comprehend the Tao are always running out of
time and space for their programs. Programmers that comprehend the Tao always
have enough time and space to accomplish their goals.
        How could it be otherwise?
                -- Geoffrey James, "The Tao of Programming"