FIG. 1 is a perspective view of a magnetic building apparatus according to the invention;
FIG. 2 is front plan view thereof;
FIG. 3 is a side elevation view thereof;
FIG. 4 is a rear plan view thereof;
FIG. 5 is a side elevation view of the magnetic building apparatus according to the invention;
FIG. 6 is a side elevation view of magnetic building apparatus according to the invention; and,
FIG. 7 is a side elevation view of the magnetic building apparatus according to the invention.
The broken line adjacent to the shaded area on the magnetic building apparatus depicts bounds of the claim and form no part of the claimed design. The remaining broken lines depict the claimed design in condition of use and form no part of the claimed design.