Two protons as dipoles — turn the spins and watch the wall of repulsion open into a door.
Honest label: this dramatises the fusion sketch's dipole analogy, nothing more. In standard physics a proton's electric charge is a scalar monopole with no spin-direction, and its magnetic moment is roughly a thousand times too weak to touch the Coulomb repulsion at nuclear range — so whether antiparallel spins truly "open a door" is the sketch's single unresolved 3/10 claim, not established physics. It's an intuition pump, honestly labelled; read the reasoning in the fusion sketch.