How a Car Thermostat Works(thermostat): Because the red and blue lines, representing warm and cold air, overlap you can conceptualize that the car is mixing the warm and the cold air to reach desired temperature.

1. Good Design - The mapping relationship between a web site link and the action it allows. The link text appears blue and by clicking the text with the cursor, the user is taken to a new web page on the screen. (http://www.parlormultimedia.com/information_design/)

1. We have the natural instinction to walk up or down a flight of stairs. We take advantage of the natural design of stairs, so sometimes when we fall down, it’s the designer’s fault not our clumsiness. There are cases where we are used to the standardized measurement of a flight of stairs, but when the design is altered, we can fall.

http://www.youtube.com/watch?v=kWo2WdJgWIE