For those who may not be familiar with the true Vedic philosophy and teachings, it is important to note that all Vedic and Hindu deities represent cosmic energies that are part of the Divine Universal Energy or the Supreme God-head.
Both these primal Male and Female cosmic energy principles are responsible for creating this Universe. Thus Shiva and Shakti together create this form-world as we know.
Kali, who represents Time, is the first and foremost of all Shakti-s, i.e. energy forms. Since all of creation manifests and exits in and thru her, she is also a representation of space- where all things can come into being.
In this way, Kali represents the Space-Time continuum which allows for this manifested material world to exist.