Building Block

FIG. 1 is a front, top perspective view of a first embodiment of a building block that shows our new design;

FIG. 2 is a rear, bottom perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a front, elevational view thereof, the rear elevational view being a mirror image thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a front, top perspective view of a second embodiment of the design of the building block;

FIG. 9 is a rear, bottom perspective view of the second embodiment;

FIG. 10 is a top plan view of the second embodiment;

FIG. 11 is a left side elevational view of the second embodiment;

FIG. 12 is a front, elevational view of the second embodiment;

FIG. 13 is a bottom plan view of the second embodiment;

FIG. 14 is a right side elevational view of the second embodiment; and,

FIG. 15 is a rear elevational view of the second embodiment.

The broken lines in the drawings are included for the purposes of illustrating subject matter that forms no part of the claimed design. The drawings contain a symbolic break. The portion between the break lines forms no part of the claimed design.