Enter the coordinates of the vector in the data entry boxes under (x,y,z). Click on each box in turn to activate it for entry, edit the entry to the desired values and press Enter. Notice as you enter different coordinates, the vector representing that position is the sum of other vectors, one along each axis.

The vector components in red, green and blue may be thought of as projections of the original vector on the x, y and z axis respectively. They would be the shadow cast by the original vector on the axis if a light beam were projected perpendicular to the axis.