Episodes

  • Theory of Colours Part II Section XIV - Conditions Under Which the Appearance of Colour Increases

    Theory of Colours Part II Section XIV - Conditions Under Which the Appearance of Colour Increases
    Jul 6 2026
    In which the interplay of glass elements in achromatic object-glasses is carefully examined, revealing how colours emerge and vanish through combinations of convex and concave lenses; the observer is then invited to consider the intriguing effects when subjective and objective refractions meet, demonstrating their mutual neutralisation and complex modulation of the sun’s image. Reflecting on the detailed investigations, a thoughtful pause is taken to justify the thoroughness of these inquiries, hopeful that future minds may distil such complexities into simpler truths.
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    5 mins
  • Theory of Colours Part II Subjective Experiments - Sections XII and XIII

    Theory of Colours Part II Subjective Experiments - Sections XII and XIII
    Jul 5 2026
    In which the delicate gradations and separations of coloured appearances are explored with attentive care, revealing how proximity to the refracting medium alters the vividness and blending of colours. The discourse further unfolds varied methods to produce and observe coloured images objectively, culminating in experiments that elegantly demonstrate achromatism and hyperchromatism through the interplay of prisms and coloured glasses.
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    7 mins
  • Theory of Colours Part II Section XI - Diotropical Colours of the Second Class - Refraction

    Theory of Colours Part II Section XI - Diotropical Colours of the Second Class - Refraction
    Jul 4 2026
    In which the delicate interplay of light and dark boundaries, as they traverse and overlie each other through prisms and apertures, reveals the conditions under which colour manifests and intensifies in both subjective and objective observations. The subtle gradations and movements of these coloured fringes upon luminous images, particularly those cast by the sun, are elegantly traced and diagrammed, demonstrating that the spectrum is neither static nor uniform but a living phenomenon shaped by displacement, perspective, and medium.
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    8 mins
  • Theory of Colours Part II Section XV - Explanation of the Foregoing Phenomena

    Theory of Colours Part II Section XV - Explanation of the Foregoing Phenomena
    Jul 7 2026
    In which we explore the nature of catoptrical colours arising from mirror-like reflection, observing how powerful, circumscribed light and minute surface features produce iridescent hues, particularly red and green, manifesting in metals and organic structures alike. We then advance to the paroptrical colours that emerge at the edges of opaque bodies, contemplating how varying illumination and shadow interplay conjure half-shadows adorned with subtle coloration, revealing the nuanced behaviour of light not as an abstract principle, but as a luminous image shaped by circumstance.
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    12 mins
  • Theory of Colours Part II Section X - Diotropical Colours of the First Class

    Theory of Colours Part II Section X - Diotropical Colours of the First Class
    Jul 3 2026
    In which the delicate interplay of coloured squares upon contrasting grounds is explored through attentive observation, revealing how coloured edges and borders produce illusions of elongation or reduction in colour intensity that shift with orientation and background. This inquiry advances to consider the chemical and physical principles behind refraction and colour, distinguishing between subjective and objective experiments, and illuminating conditions under which refraction occurs with or without colour, thereby unfolding the nuanced relations of light, colour, and perception.
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    19 mins
  • Theory of Colours Part II Section IX - Diotropical Colours

    Theory of Colours Part II Section IX - Diotropical Colours
    Jul 2 2026
    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.
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    6 mins
  • Theory of Colours Part I Pathological Colours - Appendix

    Theory of Colours Part I Pathological Colours - Appendix
    Jul 1 2026
    In which the nature of double and accessory images produced by reflection and refraction is gently unveiled, revealing how outlines and contrasts between light and dark give rise to delicate coloured borders that softly delineate objects. The interplay of these semi-transparent images upon black, white, and grey grounds is shown to yield vivid yet ethereal colour phenomena, inviting careful and thoughtful observation to discern their subtleties.
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    14 mins
  • Theory of Colours Part I Section VII - Faint Lights; Section VIII - Subjective Halos

    Theory of Colours Part I Section VII - Faint Lights; Section VIII - Subjective Halos
    Jun 30 2026
    In which the subtle interplay of light and refraction reveals how displaced boundaries and figures conjure colours along their edges, governed by natural laws that delight the observer’s eye with shifting hues. These phenomena increase with the degree of displacement and the conditions of the refracting medium, inviting a deeper understanding of primary and secondary images as they dance before the vision.
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    9 mins