Eerie Coulee Disorder, also known as ECD and sometimes referred to as the "uncanny valley", was a term for a sense of wariness that was felt by most Humans and members of other Humanoid species when in the presence of a droid that was Human-like in appearance, yet still obviously artificial. During the early years of the Galactic Empire, the company LeisureMech Enterprises marketed the BB-4000 model Human replica droid to galactic customers, but the droid was a commercial failure due to the Eerie Coulee Disorder that was experienced by those who made use of the droids.