Glad you're back, Felix!
If a photon is actually a photon cloud surrounding/revolving around a neutrino center (or a dual neutrino center), then it may be likened to a grain of sand in a football stadium. Under normal conditions with headlights of passing cars pointed at each other on the highway, photons will probably not "collide". In fact, neutrinos seem to be so fine-grained, that it is believed they can pass through the Earth like photons through clear glass. Thus, a head-on collision of neutrinos would seem almost nil and not likely to be seen in any experiments before the the late-20th century (if even then).
However, a laser is an extreme scenario where oddities can occur. If the collision is actually between neutrinos and not the photon cloud, this may be the extremely rare occurrence and a possible exception to your rule: "... photons don't collide - if they did then we would not be able to see anything!"
This blurb from a 1997 APS meeting struck me as pertinent:
What especially caught my eye was the transvestite appearance of neutrinos: "... hints that not only does the neutrino have mass and can change its form ('flavor') ...". Does it actually change its form? Or is it actually a neutrino pair with 2 flavors (+ & -)? The latter would help me build my case for photons having a core built of a pair of neutrinos.Search for Neutrino Oscillations
Two years ago at this meeting a group of physicists from Los Alamos presented evidence for neutrino oscillation, the transformation of neutrinos from one type to another, in an experiment in which a beam of neutrinos strikes a target. The Los Alamos team, represented by William Louis, and the collaboration at the Super-Kamiokande neutrino detector, represented by Kenneth K. Young of the University of Washington, recently concluded major new data analyses. Kamiokande also searches for neutrinos from the sun, from distant supernovas, and from the decay of protons. Based on the first 100 days of research in Japan, Young reported that there are hints that not only does the neutrino have mass and can change its form ("flavor"), but it may also be more abundant at night than during the day, and more plentiful during certain times of the year. If the neutrino is found to have mass, it could constitute part of the dark matter that is believed to comprise as much as 90% of the universe. - http://www.aps.org/publications/apsn...highlights.cfm
(Meanwhile, I grow frustrated in not finding the article or a reference to the 2 lasers pointed at each other and creating matter and antimatter. The reverse, a positron and electron crashing and becoming 2 photons, is a strong and potent suggestion. But the particles emerging from colliding light beams seems much more provocative and convincing.)


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