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Figure 1—figure supplement 1. (a) LED tiles are arranged in ribbons parallel to the equator and glued in between structural ribs. Gaps at the top and bottom pole of the sphere allow coupling in an optical pathway for infrared illumination and subsequent video recording of eye movement. The fish is placed at the centre of the sphere, facing the observer. See the Supplementary file 1A as well as the mathematical manual in our data repository for more on the angles βk. (b) Optical pathway for eye movement tracking. (c) To minimise obstruction and refraction, the zebrafish larva is immobilised on the tip of a glass triangle (left) using agarose, which is then inserted into the centre of a spherical glass bulb (middle). This bulb is then mounted into a metal holder (right) and thus placed at the centre of the sphere. (d) Image of the two hemispheres and the camera setup. One hemisphere is mounted on a rail to allow opening and closing the arena.