A proton. It consists of three "colored" quarks,
kept together by "gluon" fields.
Special relativity is demonstrated with high speed trains.
Here you see fast trains. The red one one goes with 87% of the speed of light. It is Lorentz contracted.
The blue train is standing still. Apart from the color, the trains are identical.
![](tgv1.gif)
Sitting in the train, you see the surroundings Lorentz-contracted. Also the blue train is short.
If you think this is contradictory, remember that simultaneity in time is perceived
differently by the different observers.
![](tgv2.gif)
See also the older animations:
A living black hole!
The Rindler coordinate frame
I also designed the Moving Version of the University Logo (see the list
of my PhD Students)