FIG. 1 is an isometric view of a stack chair incorporating my new design;

FIG. 2 is a left side elevation view thereof, the right side elevation view being a mirror image;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a rear elevation view thereof.

FIG. 1 has been shown on a reduced scale with respect to the other views.