>>706 Squeak Smalltalk

| fn |
fn := [:x :y | Float pi / 3 * #(1 -1) collect: [:theta | (y - x rotateBy: theta about: 0@0) + x]].

fn value: 2@0 value: 4@0.
"=> {3.0@ -1.732050807568877 . [email protected]} "

fn value: 1@1 value: 5@5.
"=> {6.464101615137755@ -0.464101615137754 . [email protected]}"

fn value: 5@ -3 value: -2@1.
"=> {[email protected] . -1.964101615137754@ -7.06217782649107} "