A tetraview is a visualization technique for bivariate complex functions. In the simplest case, the graph of a complex-valued function w = w(z) can be considered as a hypersurface in R^4 with four real coordinates (ℜ[z], ℑ[z], ℜ[w(z)], ℑ[w(z)]). Carrying out a rotation in four dimensions and projecting the first three coordinates into (ordinary) R^3 then allows the changes from (ℜ[z], ℑ[z], ℜ[w(z)]) to (ℜ[z], ℑ[z], ℑ[w(z)]) to (ℜ[w(z)], ℑ[w(z)], ℜ[z]) to (ℜ[w(z)], ℑ[w(z)], ℑ[z]) to be visualized continuously.