The De Stijl movement happened from about 1917 - 1931, and in Dutch, translates to "The Style". The main components that this movement emphasized and utilized were geometry and primary colors [red, blue, yellow]. The movement was pioneered by architects like Gerrit Rietveld, who began creating awesome stuff, like this chair.
Basically, every element of the chair was broken down into it's simplest form, and proportionally adjusted to create a sense of overall balance. This feeling of balance was also emphasized by the use of primary colors. The form was meant to be the most important aspect, not the material it was made of.
De Stijl was based on equivalent oppositions of form and space. Paintings by artists like Piet Mondrian are easily recognizable as the classic De Stijl style.
Decorating with De Stijl can bring visual interest into any setting. The use of primary colors can bring an exciting feeling to a room, and create a sense of unity due to the equivalent opposition that is presented. The colors themselves are bold, so they will stand out. Geometric furniture has a modern look to it, especially when the forms are reduced down.
De Stijl stylistic choices can add modernity and simplicity, while still maintaining a feeling of excitement with it's bold colors and geometric angles. Consider incorporating some of these characteristics into your own space!