Many-centered arches

If you draw a circle from a center found

Inside an arch and just go round

You can make your bricks all march

In step with a Roman arch

If you select more than one

Center you can have some fun

With different sized radii.

Plays a trick upon the eye

 

An arch with some different centers

Will create like an inventor’s

Idea of a rounded form

And step outside the circular norm.

 

The effect of vertical mullions

is an architect's ebullience

for fancy windowed mansions

with horizontal transoms.

 

If you are a really big fan

of giant windows with widest span

be careful and listen as I beseech

you not to weaken and overreach

 

As you design your giant window

there's a limit how far to go

If your engineer's skill does lapse

Your giant window will collapse.