Circle, triangle, and square. They’re simple, geometric, and eerily familiar. They look like something pulled straight out of a PlayStation controller or a childhood game of tic-tac-toe.

The triangle will be visible until about mid-March, though again, the shape will shift significantly between now and then.

Inside a barn, three people start to sing a song and dance. ALL: (singing) A square and a rectangle, a circle and a triangle. A square and a rectangle, a circle and a triangle. BOY: If you’re ...

Image caption, STEP 3: Place the compass at the points where the arcs cross the circle and draw a small ... you now have a regular equilateral triangle.