Transparence light particles (トランサパランス・ライト・パーティクル toransaparensu Raito Pātikuru), or simply trapar (トラパー torapā), are a form of energy produced by the Scub Coral. Trapars are a particulate matter which behaves much like water or strong wind currents. In order to "ride" trapar, the utilization of reflection films are required which are created from captured skyfish. Trapar are released from the Scub Coral's powerful metabolism. As a result, trapar can be completely manipulated and produced by coralians.
While trapars are a central constant in the main show as a source of energy and rideable trapar waves, the nature of their tangibility is left mostly a mystery until Episode 37, Raise Your Hand, in which an interview between Norb and Greg Egan reveals, though somewhat vaguely, the true nature of trapar. A summary of their discussions in regards to trapar is that it is a form of thought energy produced by the Scub Coral, the wavelengths of which seem to coincide with similar brainwaves of various emotions. The implication is that human thought and emotions can resonate, effect, and be affected by the trapars; the Compac Drive is seen as an "amplifier" for the human emotional waves, and as such allows humans to affect the trapar and communicate with the Scub Coral and their Archetypes on a subsconscious level, an example being that happy thoughts near compac drives cause the appearance of Skyfish who are entirely connected to the trapar waves themselves.
This interpretation allows for a few speculations in regards to some of the specifics of various Eureka Seven moments/mechanics:
- Shared dreams in the series, such as in Acperience 1 and Opposite View could be from multiple characters resonating via the trapar and as such allow them to emotionally effect each other across long distances via the streams without direct connection to the Command Cluster; with both Eureka's and Anemone's coralian states allowing them to "tune in" more easily, and their earlier shared dream in close contact during Acperience 1 making the 3 more directly attuned to each other. This also explains Eureka and Anemone's shared reactions to various incidents with the Scub Coral, despite both being seperate from the Commmand Cluster and therefore unable to directly understand its thoughts.
- Large waves from tectonic shifts across the planet may be due to the momentary awakenings of small clusters of Scub Coral causing a quick surge in thought energy before immediate rehibernation, causing quick dramatic spikes in trapar as a result.
- The Nirvash type ZERO's Seven Swell Phenomenon could also be seen as a momentary awakening of nearby scubs resonating with Eureka and Renton's thoughts and emotions momentarily, causing the dramatic increase in trapar levels around. This also explains why the phenomenon lasts exactly the same amount of time as the Antibody Coralians take to turn to salt (that being after 1246 seconds) with the ground underneath the Seven Swell turning to salt as well, the implication being that the scubs immediately underneath them are resonating emotionally, temporarily awakening, creating trapars due to this and then dying afterwards, the same as the antibodies.
- Desperation Disease, like the shared dream hypothesis, is a similar human resonance via the trapar, only this time directly connecting the humans to the Command Cluster itself, the initial emotional "signal" to connect to the Command Cluster seems to require a Compac Drive, but, once connected, those affected by the disease seem to at that point be fully tuned into the Command Clusters trapar signal, and as such seem to no longer require the compac drive to maintain a connection; this could also imply that Diane Thurston may also be afflicted by the Desperation Disease as a means to also become part of the Command Cluster.
In AO, trapars are not very abundant in the atmosphere and have to be mined from Scub Coral remains. Ao utilizes his ability to see trapars to pilot the Nirvash Neo by following their flow. Also, the fact that the main difference between Ao and humans is his ability to see the Infrared and Ultraviolet spectrums; puts trapars somewhere in either of the two light spectrums (likely being in the Ultraviolet spectrum as it has a higher energy level than infrared.) Also in Eureka Seven: AO, it is revealed that trapar is a danger to the well-being of a Human-Coralian hybrid and is even fatal to the hybrid in dense quantities; seen when it was revealed that Renton and Eureka's daughter turned to stone and died three months after birth due to the Human and Coralian cells rejecting each other because of the atmosphere of their world. Renton and Eureka's decision to send their son, Ao, to the past in another universe would prevent him from suffering from the same fate as the atmosphere there would allow him to survive.