At this point in particle physics there is still a zoo of particles to be accounted for. One of the main features of the set of thirty or so particles is that there are three generations of leptons, neutrinos, +2/3 quarks, and -1/3 quarks. The question that this raises is why are there only three generations? If it turns out that there are more generations that we just haven't observed, one should wonder that maybe these entities are actually compound entities.
In other words, a down quark (-1/3) is the ground state of some quantized dynamic system, the strange quark is the first-excited state, and the bottom quark is the second excited state. Each are at progressively higher energies. In similar fashion, the up quark (+2/3) is a ground state, the charm quark is a first-excited state, and the top quark is a second-excited state of another quanitized dynamic system. Also the leptons would have the electron (-1) be a ground state, the muon would be a first-excited state, and the tau would be a second-excited state.
If the three systems are similar in nature, it might be reasonable for them to be made up of two particles, one of +1/6 charge, and the other of +/- 1/2. I call the +1/6 particle "Gumby", and the +/- 1/2 particle "Pokey". In order to form the -1/3 quarks, we would have a -1/2 Pokey particle orbiting a +1/6 Gumby particle. The +2/3 quarks would be formed by a +1/2 Pokey particle orbiting a +1/6 Gumby particle. And for the leptons, we would have a pair of -1/2 Pokey particles orbiting each other. Neutrinos might be a +1/2 Pokey orbiting a -1/2 Pokey.
This is a hypothesis, not a theory. I'm afraid I cannot propose an equation which explains the observed energies of these various particles. However, if we do a little extrapolation, this hypothesis does predict that the third excited state of the -1/3 quarks should be observable in the near future, probably in a range similar to that where the Higgs particle is to be found.
One might as well propose that continents move.