Fig. 1. `Open' controls, with sky view throughout the whole maze. (A,B) `Z'-shaped maze, with eastward (A) and westward (B) orientation of the middle leg. (C) Straight control (schematic top views of all channels). (A) Expected direction 315° (filled arrowhead), mean vectors, at 1 m, 2 m and 3 m radii: 319.9°/319.8°/324.2° (arrows); vector lengths 0.91/0.96/0.98; N=24, 23, 20. Mean vector not significantly different from expectation at 1 m and 2 m; at 3 m significantly different (P<0.01). (B) Expected direction 45°, mean vectors, 42.1°/47.9°/47.2°; vector lengths 0.98/0.97/0.98; N=23, 23, 23. Mean vector not significantly different from expectation at all radii. (C) Expected direction 0° (north), mean vectors, 3.1°/2.1°/6.8°; vector lengths 0.93/0.96/0.97; N=25, 20, 11. Mean vector not significantly different from expectation at all radii. Note that some data points obscure others with identical azimuth.