Sonnet to Black (Blue Spiral); Sonnet to Black (Black Spiral)

Sir Terry Frost, R.A. (1915-2003) Sonnet to Black (Blue Spiral); Sonnet to Black (Black Spiral) each signed and dated 'Frost 91' (lower right) each oil and collage on canvas on board the first 8¾ x 8¾ in. (22.3 x 22.3 cm.); the second 7¾ x 7¾ in. (19.7 x 19.7 cm.) (2)