I agree, and have always thought of it like that. St. Augustine taught that the imprit of the Trinity is in each of us, hence why we were created in His image.
You could look at it in various ways:
Heart (Father), Mind (Son), Soul (Holy Ghost).
Not only that, I think the Trinity has left its imprint in creation and on science as well.
One atom is made of three particles: Protons, Electrons, Neutrons.
Water (one of the all important symbols in the Bible), though one substance, can exist in 3 ways: Ice, Liquid, and Evaporation.
There are 3 states of matter: Solid, Liquid, Gas.
The family, too, has the imprint of the Trinity. The Father begets the Son (Eternal Truth), and they produce the Holy Ghost (Eternal Love); a father and a mother produce offspring from love.
Not that any of this could be a sign of the imprint of the Trinity; just some interesting thoughts.