“…Printed text is an aggregation of letters in horizontal lines, and the typically high contrast letters on the page, and repeated patterns of letter formations, may create anomalous visual effects, such as illusory colours, shimmering and vertical motions throughout the body of the text. These illusions can be accompanied by somatic reactions, such as nausea, eyestrain, headache and tiredness (Wilkins, 1995;2003;Conlon et al, 1999;Harle et al, 2006;Shepherd et al, 2013). Readers who are affected by these discomforting symptoms may complain about the "blinding whiteness" of the page and the experience of "moving", "tilting" and "blurring" letters and words.…”