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The ornamental design for a building block, as shown. |
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FIG. 1 is an isometric view of a building block according to the invention;
FIG. 2 is a side elevation of a building block according to the invention;
FIG. 3 is a top plan view of a building block according to the invention;
FIG. 4 is an end elevation of a building block viewed from the left of FIG. 2 according to the invention; and
FIG. 5 is an end elevation of a building block viewed from the right of FIG. 2 according to the invention.
Rassias, John N., Clark, Cecily M.
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