Figure 1: A skyrmion in a two-dimensional magnet. The small arrows represent the magnetization direction. The magnetic field $\mathbf{\text{B}}$ is applied in the upwards direction. For skyrmion lines in a three-dimensional magnet, as suggested by recent Hall effect measurements for $\text{MnSi}$ [1, 2], this pattern describes the magnetization in planes perpendicular to $\mathbf{\text{B}}$.