Figure 3.

Four-dimensional ants nests from the same donor colony under the different experimental treatments. (a) Colony 6 under the 0P treatment. The nest has reached the edges and bottom of the experimental container by 24 h. (b) Colony 6 under the 2P treatment. The nest has reached the edges of the experimental container by 18 h. (c) Colony 6 under the 4P treatment. The nest has reached the edges of the experimental container by 24 h. Scale bars, 50 mm in total for the final nests and divisions show the position of the planes between layers. (Online version in colour.)