Circumbinary disc in r3: the binary plane lies in the xy-plane and the disc is initially inclined (i₀ = 120°, Ω₀ = 0°). At 165 binary orbits, we observe that the tilt is different between the inner and the outer regions of the disc (cf. Fig. 4). This is interpreted as the disc being broken in two discs by the binary. The inner regions experience polar alignment, causing the whole disc to become polar after roughly 400 binary orbits (cf. Fig. 2). At 1000 binary orbits, the disc is almost perfectly polar.