FIG. 1 is a side perspective view of the barrel stave lamp of my design;

FIG. 2 is another side perspective view of the barrel stave lamp of my design;

FIG. 3 is an enlarged top perspective view showing the top opening in the cylindrical shape light diffuser; and,

FIG. 4 is an enlarged top perspective view of the barrel stave lamp. The evenly spaced broken lines shown in the drawings illustrate unclaimed portions of the design and form no part of the claimed design. The dash-dot-dash lines shown in FIG. 4 demonstrate the bounds of the claimed design and form no part of the claimed design.