How does Shi Nai'an use imagery in Water Margin?

Imagery:

"But yesterday evening you came back drunk and beat up the gate-keepers, broke the vermilion latticed door of the surra hall and drove out the cooks and janitors, shouting and yelling all the while."

"The destroyer of our country is home and tree. Put the top of the character for 'home' over the character for 'tree' and you've got the character 'Song.' He's the man who'll pillage our country's money and grain. Then, water and work are armed soldiery - the second line. Place the 'water' radical next to the character for 'work' and you've got 'Jiang,' the man who will raise armed soldiers. And it's Song Jiang who's written the rebellious poem. This is a warning from Heaven."