His work is multimedia-based, specializing in drawing, sculpture, live performance, animation and film; the majority of which addresses South Africa's history as regards the subjects of apartheid and colonialism. William and his work has been described thus:
[...]a remarkably versatile artist whose work combines the political with the poetic[...]his work is often imbued with dreamy, lyrical undertones or comedic bits of self-deprecation that render his powerful messages both alluring and ambivalent.

