The “Moore-Penrose inverse” of a matrix A corresponds to the (unique) matrix solution X of the system AXA=A, XAX=X, (AX)^T=AX, (XA)^T=XA. This generalized inverse has many applications, ranging from Gauss’ historical prediction for finding Ceres to modern electrical engineering problems. The present paper provides some applications related to art: one about mathematical color theory, and one about curve fitting in architectural drawings or paintings.