Probably no one. Someone may have said "All that is essential is seen through the heart", but that was not what you asked.
Of course ... Heart Surgeons have seen many hearts.
Eugene Record wrote "Oh Girl" and "Have you seen her".
An EKG is a graphical image of the electrical system of the heart. Heart attacks frequently cause changes in how electricity flows through the heart. Because of this, the changes can frequently be seen on an EKG after the heart attack has had time to heal.
to be seen by
Plato
the human heart can be seen with the naked eye if chest is open
Glass that can be seen through may be called transparent.
As Seen Through a Telescope was created in 1900.
John 14:9 Whoever has seen Me, has seen the Father.
A 'heart symbol' is a concrete noun, a thing that can be seen or touched.
Sigmund Freud's psychoanalytic theory can be applied to Heart of Darkness through the concept of the unconscious mind, representing the darker aspects of human nature. The journey into the heart of Africa can be seen as a metaphor for exploring the depths of the unconscious, where repressed desires and fears are confronted. Characters like Kurtz can be seen as embodiments of Freud's idea of the id, driven by primal instincts and desires.
The veins return blood from the body back to the heart, then out of the heart to the lungs where it is oxygenated, then back to the heart and carried back out into the body by arteries. The blood in the veins is blue but is seen through you skin as a dark green.