A partial attempt has been made to include 'opposite' types of paths within single items of the list, but at some later day this effort should be taken further. At that point it will become necessary to confront the semantic, linguistic, and structural problem that there are many different senses and types of opposites, for many or all the types of paths indicated in this organon. Opposites are distinguished inside the list items by being separated by a hyphen flanked by two spaces (i.e. by the device "-")
Occasionally synonyms, closely related types and subtypes are sublisted within the items.
Cross references to other items are made in some items: e.g. "(cf. #36)" in item #7. Again these serve to indicate similar and related types of paths.
A feeling for the great number and diversity of forms, subtypes, and senses that may conceivably exist and be pertinent to the different types of paths itemized on the list may be gotten if we treat a few of the list's items in exemplary detail. We do this for four items that have virtually been chosen at random, but comparably exhaustive breakdowns should eventually be done for every item on the list (please see the table "Differentiable Forms, Subtypes, and Senses of Four Types of Paths").
We will now discuss the meaning of some of the items in "99 Types of Paths".
Active vs. Passive paths:
By an active path might be meant one that changes or develops over time rather than remaining the same; or that directly causes or contributes to the movement of something over itself, rather than simply being a passive servant of something that moves along the path under its own momentum or as energized or directed by something in the larger environment; or that reacts to or interacts with what traverses or creates it; or the like.
A path may variously be wholly active, partially active, or wholly passive. The path of an arrow in flight is a wholly active path to the extent that the arrow creates it ex nihilo. Of course the reality may be that the eolian dynamics and densities of the ray of air subtended by the arrow's path help to determine it and hence make it partly passive.
Turbulence induced by the motion of the more forward parts of the arrow will perturb the more rearward portion of the arrow, and hence, by deflecting the missile, will make the remainder of the path (and really all of the path) self-evolutionary (or active).
Yet not even electrical wires or roads are absolutely passive paths. The currents carried by wires produce electromagnetic and thermal torques and lower-order effects, and roads are active to the extent that their precise form induces unpredictable complexities in the motions of the traffic they bear that ultimately may lead to the future modification of the road course and form.