Many machines need to be aware of the objects and spaces around them. This might be to detect when something arrives or leaves, to measure how high something is or to see how far away an obstacle is. It is the position of things relative to the machine that affects the decisions that the machine must make. Human centric visual characteristics are not important to a machine. It is the pure logical concepts of presence, absence and position that determine what actions must be taken. This is where lidar excels as it clearly identifies objects and can measure the spaces between them.