An exercise in increasing understanding of a concept:
1) Find a picture which shows the concept directly or 2) Find a picture which has some similarity to the concept, then 3) Find a picture which is the opposite of the concept
repeat 1-3 until the concept is easier to grasp and remember.
This can be done with trading concepts or ideas, or anything.
example:
1) A Chart Trend:
2) Find a picture which has some similarity to the concept (optional)
"trendy"
3) Find a picture which is the opposite of the concept: