Fifteen inches LCD
Electronic mouse
And bunch of scratches of sheets.

There were roof lines
Valleys and ridges
Encircling the overlapping layers
Some are frozen, some are hidden.

Estimation and calculation
Uttering numbers
With various actions.

3D walls
Inserting commands
Subtracting openings
Including doors and windows.

The formula was easy
To multiply and subdivide
Real aesthetical features
Future renovation
For firm edification.

(6/30/14 @xirlleelang)