In which the curious interplay of colours upon grey and differently tinted surfaces is gently explored through the examination of coloured objects displaced by refraction, revealing subtle effects of homogeneous and heterogeneous edges that play upon our perception of form and boundary. The ensuing observations unfurl the delicate balance of light and shade as prismatic hues extend, diminish, or alter the apparent size and brilliance of coloured squares against contrasting grounds, inviting the attentive observer to ponder the elusive flicker of ocular deception.