The ornamental design for a playpen, substantially as shown and described.
FIG. 1 is a top view of a play pen showing my new design;
FIG. 2 is a vertical, cross-sectional view thereof taken along line II--II
of FIG. 1;
FIG. 3 is a top, perspective view thereof;
FIG. 4 is a top, perspective view taken from the opposite side of FIG. 3
showing parts of the side walls cut-away to more clearly illustrate the
interior design thereof and,
FIG. 5 is a fragmentary elevational view of one of the wheels shown in
FIGS. 2 and 3.