multi panel canvas art Scope, Time, and Cost make up the three corners of the triangle that project management professionals make reference to as 'project constraints." In an equilateral triangle, seventy one corners are equal, and projects can be found in on time and so on budget, while addressing all in the needs originally expressed by project stakeholders. However, if just one from the corners starts to drop out of line with expectations, your entire project can be distorted. Sunglasses allow better vision in bright daylight, and may protect one's eyes against damage from high levels of ultraviolet light. Typical sunglasses are darkened for protection against bright light or glare; some specialized glasses are clear in dark or indoor conditions, but turn into sunglasses when in bright light. Most sunglasses do not have corrective power in the lenses; however, special prescription sunglasses can be ordered. Specialized glasses may be used for viewing specific visual information (such as stereoscopy) or 3D glasses for viewing three-dimensional movies. Sometimes glasses with no corrective power in the lenses are worn simply for aesthetic or fashion purposes. Even with glasses used for vision correction, a wide range of designs are available for fashion purposes, using plastic, wire, and other materials.