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What's new?


January 2020: Panorama with Moon



Afterglow, Sky colours


November 2019: Frost patterns



November 2019: Reed



June 2019: Noctilucent clouds (extended July 2019)


March 2019:Mirrored ice


March 2019: Rays and clouds


December 2018:Curved light rays



November 2018: A glass door prism



September 2018: Light patterns



August 2018: Real Yellow



August 2018: Iridescent weathered glass



August 2018: Gleaming sky – zero order glow



July 2018: Colourful reflections in a spider's sheet-web


June 2018: Iridescent butterfly wings


May 2018: Very strange interference colours on ice



March 2018: Fresnel diffraction


March 2018: The Poisson spot


January 2018: Unexpected stripes – elliptic polarisation



December 2017: Goethe's black and white crosses



November 2017: Colourful Black II: Iridescent Vinyl


November 2017: Colourful Black


October 2017: Quetelet rings


September 2017: Glistening spider silk



August 2017: Dewed windowpane aureole II


June 2017: Curtain diffraction

April 2017: short paragraph on pleochroism
February 2017: Polar lights once more
click!January 2017: Coloured reflection
click!December 2016: Sunlit hot tea
click!November 2016: Munker's illusion applied
click!October 2016: Fluorescence of chlorophyll
click!October 2016: Spiderweb against the sun
click!October 2016: Wavy images
click!September 2016: Road mirages
click!September 2016: Light rings and diffraction from thistle-seed pappus
click!August 2016: CD-R diffraction
click!July 2016: Sun pillars and glitter paths
click!June 2016: Glory around vanished shadow
click!May 2016: Single-drop rainbow and supernumerary colours
click!April 2016: Droplets, bokeh and diffraction
click!March 2016: Corona discharges, artificial St Elmo's fire
click!February 2016: Kelvin wakes
click!February 2016: Polar lights
click!December 2015: A circumzenithal arc
click!December 2015: Reflections
click!November 2015: Light rings
click!October 2015: Frying pan optics
click!September 2015: Behind the rainbow
click!September 2015: Stars by diffraction
click!August 2015: Glasses for 3d-films
click!July 2015: Dragonflies' eyes
click!June 2015: Ermine moths' web tents
click!June 2015: Strange colours in a foil-greenhouse
click!April 2015: Turbid water aureole
click!April 2015: Puddles and iridescent clouds
click!March 2015: Bluish smoke with reddish shadow
click!March 2015: Section on Chameleons' colour changes extended
click!February 2015: Lunar corona
click!January 2015: Schrödinger's cat
click!January 2015: Smooth ice with large monocrystals
click!January 2015: Glory and Brocken Spectre
click!December 2014: Section on Tyndall scattering extended
click!December 2014: Peculiar window frost
click!November 2014: Dewed windowpane aureole
click!October 2014: Dewbow reflexes and Fresnel diffraction
click!October 2014: Moonstone (in extended section on labradorite)
click!September 2014: Sunlit star effect foil
click!September 2014: A huge moiré
click! August 2014: Light-interference pigments
click! June 2014: Split rainbow
click! April 2014: Greenish and reddish iridescence of meat
stacked films

March 2014: Computing colours

sprinklerMarch 2014: Iridescent glass bottles
criticism January 2014: Criticism of Kueppers' Theory of Color
click!January 2014: Star effect foil
traffic signDecember 2013: Traffic signs – retroreflective foils
click!September 2013: Waves and caustics
C. aurataAugust 2013: Beetle circular polarisation
click!July 2013: Interference on double-glazed window panes
gloryMay 2013: Mie scattering
click!April 2013: Quételet rings or fringes
click!March 2013: Acrylic glass as a diffraction grating
click!Diffraction by feathers
click!An irregular reflection grating