FIG. 1 is a front right perspective view of a first embodiment of a modular sofa showing my new design;
FIG. 2 is a rear left perspective view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a front elevation view thereof;
FIG. 5 is a rear elevation view thereof;
FIG. 6 is a right side elevation view thereof;
FIG. 7 is a left side elevation view thereof;
FIG. 8 is a front right perspective view of a second embodiment of a modular sofa showing my new design;
FIG. 9 is a rear left perspective view thereof;
FIG. 10 is a top plan view thereof;
FIG. 11 is a front elevation view thereof;
FIG. 12 is a rear elevation view thereof;
FIG. 13 is a right side elevation view thereof; and,
FIG. 14 is a left side elevation view thereof.
FIGS. 8-12 include a symbolic break shown in broken lines. The broken lines as well as those portions of the article between the break lines form no part of the claimed design.