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Fig. 1. Cylindrical flight chamber (height and diameter, 2.4 m). The circular floor
is filmed from above using a video camera (VC). Bees entered the tent through
the entry tube (ET), attached to a white painted side wall (SW). Bees flew to
the 1.9 m-distant food hole (FH), which gave access to a feeder (not shown).
Discs on the floor provided visual feedback. The inset shows a plan view of
the set-up with the locations of the landmarks used in the experiments: (1)
paper square (side length, 25 cm); (2, 3) cylinder (diameter and height, 25
cm) located 0.5 m to the side of the food hole; (4) same cylinder, located 1 m
to the right of the center.