The Zebra command helps you visually analyze surface smoothness and curvature.
Consider that the zebra stripes jump sideways as they cross the connection from one surface to the next or if the two surfaces touch, but have a twist or crease at the point where the zebra stripes jag. This indicates G0 continuity between the surfaces.
If the stripes line up as they cross the connection but turn sharply at the connection, means that the position and tangency between the surfaces matches. This indicates G1 continuity between the surfaces. Surfaces that are connected with Fillets usually display this behavior.
If the stripes match and continue smoothly over the connection, this means the position, tangency, and curvature between the surfaces match. This indicates G2 continuity between the surfaces.
Summarizing the above,
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In the above images, conditions 1, 2 and 3 illustrate the the G0, G1 and G2 continuity respectively.