Perception and safety

Last night, I slept in a different room. Woke up at night, and while going back to bed, I hit the cot and almost fell, getting hit injury on the knee.

I thought to be careful and my injury may be due to getting old and loosing my control over my movements. 

Later today,  it occurred to me that my fall is due to presumed bed position in regular room, though I slept in another room.

This presumption without realizing facts can happen anywhere. Someone removes guard on rotor, but regular operator not realizing will work closer to it and may get injured. Because,  he will be under notion of existence of machine guard. 

A caution Board will help to make users to know the change made and to be careful.