ABC Wednesday—U is for "under construction"

I was a kid in the mid 20th century, a time when girls 
played with dolls—and my older brother got 
the Lionel trains, Lincoln Logs, and ... the erector set.
If I'd been allowed to play with "his" toys, who 
knows?  I might have grown up to be a good 
mom and an architect.  Just sayin'.

[To see more ABC posts for the letter U, go here.]