Resolution with rollerblades at Watchtree

We talk about the ability of waves to detect particles. If the waves are about the same size as the particles, then the particles can be detected. Above, the stones in the tarmac were easily detectable by the wheels because they were much bigger than the ones below. Below, it felt smooth when in fact it is still made of small grains. The closer to wheel size, the more detectable.

This is one aspect of resolution of measuring instruments. The rollerblades were unable to resolve the smaller particles.