Patent ID: 6907705

Claim:
A block comprising: a first side; a second side; a third side; a fourth side; a fifth side; a sixth side; a seventh side; and an eighth side, wherein the first side joins the second side in an angle of α°, wherein the second side joins the third side in an angle of α°, wherein the third side joins the fourth side in an angle of δ°, wherein the fourth side joins the fifth side in an angle of λ°, wherein the fifth side joins the sixth side in an angle of α°, wherein the sixth side joins the seventh side in an angle α°, wherein the seventh side joins the eighth side in an angle of (270°−α°), wherein the eighth side joins the first side in an angle (270°−α°), wherein (λ°+δ°+2(α°))=540°, and wherein (270°−α°)≠δ°.