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The LEGO light sensor is actually unable to distinguish colors. Its ability is limited to
detecting light and measuring its intensity.Thus, we are going to distinguish the color of
the bricks through the amount of light that they reflect back into the sensor. For this
reason some colors, which reflect a similar amount of light, are nearly indistinguishable.
For example, it’s very hard to tell a black brick from a blue one, or a gray brick from a
green one.

Pickup Stand Step 0

Pickup Stand Step 1

Pickup Stand Step 2