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. Notice how the path is in the most convenient place to walk relative to the crosswalk painted on the street and the dip in the curb. It looks like there should be a sidewalk here, but someone fot to put it in. Instead of putting in a sidewalk, someone put in a sign to try to tell people not to walk on the grass. Watch your step! One human factors problem I have found involves walking in from the bright outdoors into a dark building and encountering an almost invisible step. This example es from a library lobby. The warning sign isn39。s restroom. The fixture in the corner affords a certain activity. To try to discourage this activity someone taped a small sign to the wall above the fixture. The sign says This is a mop sink. Smooth as glass This picture shows the hot water control knob on the bathroom sink in a fancy hotel. You can tell it39。t get any leverage. Please push slowly! Ever wonder why doors are made out of glass? This picture gives a hint. Imagine that these restaurant doors are both closed and someone tries to leave in a hurry just as someone else tries to enter the restaurant from the outside. The doors are made of solid wood and are beautiful to look at but you can39。t open up like a typical bathroom mirror. So to see and access what is on the shelves behind the mirror is difficult. You have to look and reach around the m