Building block, system and method

A wall system for building a wall comprising:

• (A) a main block comprising:
• a first back surface;
• first and second side surfaces coupled to the back surface;
• a first top surface coupled to the back surface and to the first and second side surfaces, wherein the first top surface includes a first lift and alignment device for lifting the main block when the main block is being placed, the first lift and alignment device aligning a subsequently-placed block with respect to the main block, the first lift and alignment device overlying a first longitudinal axis that intersects a first center of gravity for the main block, resulting in the first lift and alignment device being a predetermined distance from a first front face of the main block;
• and
• a first bottom surface coupled to the first back surface and to the first and second side surfaces, the bottom surface including at least one recess positioned to receive the lift and alignment device of a previously-placed block;
• (B) an extended block comprising;
• a second back surface;
• third and fourth side surfaces coupled to the second back surface;
• a second top surface coupled to the second back surface and to the third and fourth side surfaces, wherein the second top surface includes a second lift and alignment device for lifting the extended block when the extended block is being placed, the second lift and alignment device aligning a subsequently-placed block with respect to the extended block, the second lift and alignment device being the same predetermined distance from a second front surface of the extended block as the distance from the first lift and alignment device to the first front surface of the main block, wherein the second lift and alignment device does not overlie a second longitudinal axis that intersects a second center gravity for the extended block.