Isometric Drawing

Study the image shown below. Starting at the lowest step, count the number of steps that must be taken in order to reach the top. What is the answer?
This diagram presents an interesting exercise in isometric drawing. Carefully follow the measurements given on the dimensioned diagram on page 2 in order to produce the given design.
How is the illusion created? Can you explain the trick?

Carefully follow the measurements given on the dimensioned diagram below in order to produce the given design.