Equations No 11 , 1978. Graphite and color pencil on paper 9 ⅛ x 12 ¾ in. (23.2 x 32.4 cm.)

Equations No 2 , 1978. Graphite and color pencil on paper. 9 ⅛ x 12 ¾ in. (23.2 x 32.4 cm.)

Equations No 6 , 1978. Graphite and color pencil on paper. 9 ⅛ x 12 ¾ in. (23.2 x 32.4 cm.)

Equations No 13 , 1978. Graphite and color pencil on paper. 9 ⅛ x 12 ¾ in. (23.2 x 32.4 cm.)

Equations No 21 , 1978. Graphite and color pencil on paper 9 ⅛ x 12 ¾ in. (23.2 x 32.4 cm.)

Equations No 30 , 1978. Graphite and color pencil on paper. 9 ⅛ x 12 ¾ in. (23.2 x 32.4 cm.)

Equations No 33 , 1978. Graphite and color pencil on paper. 9 ⅛ x 12 ¾ in. (23.2 x 32.4 cm.)

Equations No 34 , 1978. Graphite and color pencil on paper. 9 ⅛ x 12 ¾ in. (23.2 x 32.4 cm.)

O Pao nosso de cada dia , 1978. (Our Daily Bread) Bread bag and postcards. 9 ⅛ x 12 ¾ in. (23.2 x 32.4 cm.) Detail

O Pao nosso de cada dia , 1978. (Our Daily Bread) Bread bag and postcards. 9 ⅛ x 12 ¾ in. (23.2 x 32.4 cm.) Detail

O Pao nosso de cada dia , 1978. (Our Daily Bread) Bread bag and postcards. 9 ⅛ x 12 ¾ in. (23.2 x 32.4 cm.) Detail

O Pao nosso de cada dia , 1978. (Our Daily Bread) Bread bag and postcards. 9 ⅛ x 12 ¾ in. (23.2 x 32.4 cm.) Detail

O Pao nosso de cada dia , 1978. (Our Daily Bread) Bread bag and postcards. 9 ⅛ x 12 ¾ in. (23.2 x 32.4 cm.) Detail