Three pairs of sculptures
When you measure a particle, you can only look at one property at a time.
Three pairs of the sculptures represent three different properties, or in other words, three different measurable observables.
The first pair of sculptures is connected by the same weight, which represents the mass of a particle.
The second pair of sculptures is connected by similar form, which represents the spin of a particle.
The third pair is connected by the touch-light relationship that represents the energy of a particle.
These three pairs of sculptures also represent entanglement. When we measure one property of a particle, we can see the effect on the other particle that is how we know that they are entangled.