Sjef Voets does not have a strong preference for one material over another. Using the right technique, it should be possible to set up the things he has seen, heard, read or experienced in a particular material. The idea he has is focused on the material, while the changes he makes to the material are focused back on an idea. He tests his ideas and materials to see if they project the expressiveness he demands of a sculpture.
His sculptures are an offshoot of his personality, but in the final form of the sculpture, he wants that emotional quality to transcend the strictly personal elements. In this sense, a good sculpture no longer needs its creator. Only then does a work of his become an autonomous object.