Well, here it is. . . . My T.O.E.
It's simple, functional and drawn in nice colours.

The labels are fairly generic, but more specific labels can be used depending on the application. Work can also represent Mass, Effort can also represent Resitance and Ease can represent Permeability.
The label for the right angle has been ommitted, enough to say that as a right angle it implies that whatever you are trying to resolve is in the same, or similar, Frame of Reference. For the moment I'll just leave it as a right angle.
Not convinced ?
Here's a worked example.
Re-label the side Work as Mass and the angle Effort as Frequency
Whatever right angled triangle you draw, now alter the size of the Mass or the Energy. The two angles change as well.
Take the TAN of the angle your have relabeled Frequency and check it against its original value.
Double the Energy and the Frequency will increase by a factor of 2. Double the Mass and the Frequency is reduced by half. Any values in between will correctly provide you with the change in Frequency.
Of course it works if you alter the Frequency angle as well, giving you the resulting Mass or Energy, which ever one you were looking for.
A very simple example showing that far from being an interesting curriosity, that it does actually provide real answers to problems.