By implied 3D object I mean the the 3D object that one would represent by the given 2D image.

What do you mean by "quite interlinked enough?

Do you mean the two equal tetrahedrons don't quite reach far enough into each other? To me it seems that they do (ie the edge of one passes through the edge of the other).

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"They reasoned that an object situated at the center and related equally to the extremes in every direction can have no impulse to move in any specific direction. In fact, they compared the situation of such an object with that of a man violently but equally hungry and thirsty, standing at the same distance from food and drink and unable to decide in which direction to move." - Aristotle