English: 1=Difference image sequences. Detail of the experimental Giant honeybee nest (cf. Additional File 1, Movie S1 and Additional File 6, Movie S5). For comparison, the image sequence refers to the same 15 s displaying the shimmering waves shown in Additional File 6, Movie S5. Left, left-camera image; right, difference image giving the subtraction value of Δlumi,i-1 = lumi - lumi-1 between the actual frame fi and the preceding frame fi-1; numbers refer to frame and time (in ms) information; the left image shows inverted luminance values (2.5 MB, MPG).