1 Structure = lattice + basis

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Here is the honeycomb structure. The associated bravais lattice is the set of x's seen by clicking on the lattice button over the left hand frame. Extending the lines of the x's converts the bravais lattice to a collection of parallelograms or unit cells which cover the plane. The bravais lattice is defined by the lengths a1 and a2 of the edges of the parallelograms and the angle phi between them. The sliders labeled A1, A2, B1, B2 define the positions of atoms A and B within the cell. That is all the information required to define this infinite crystal structure.

Use the mouse (with the left button down) to drag the handles of the A1 and A2 sliders to change the values to zero. Has the structure changed?