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FEBRUARY 1971 Leo Castelli SQUARE PROGRESSIONS (143-A) Untitled 1970 (143-B) brass with red boxes 5" x 75" x 5" $7,500. (144-A) Untitled 1970 (144-B) brass with blue boxes 5" x 75" x 5" $7,500. (145-A) Untitled 1970 (145-B) clear anodized aluminum with purple boxes 8" x 161" x 8" $12,000. (163) Untitled 1970 plain aluminum with purple boxes 8 1/4" x 253" x 8 1/4" $18,000. ROUND PROGRESSIONS (159-A) Untitled 1970 brass 5" x 40" x 9" $4,500. (178-A) Untitled 1970 copper 5" x 40" x 5" $4,500.