"Mr Escher's office please"
"Up the stairs, keep turning right"
—@MooseAllain

In Real Life

Cartoon

—New Yorker Cartoon By Robert Leighton

Logo Version

to piece :size
  lt 60
  fd :size
  lt 120
  fd (3* :size)
  lt 120
  fd (4 * :size)
  lt 60
  fd (1* :size)
  lt 120
  fd (3* :size)
  rt 120
  fd (:size)
end
to shape :size
  piece :size
  rt 120 
  piece :size
  rt 120
  piece :size
  rt 120
end
shape 50

to piece :size
  lt 60
  fd :size
  lt 120
  fd (4* :size)
  lt 120
  fd (5 * :size)
  lt 60
  fd (1* :size)
  lt 120
  fd (4* :size)
  rt 120
  fd (2*:size)
  pd 
  pd
end
to shape :size
  piece :size
  pu
  rt 120
  fd :size
  pd
  piece :size
  pu
  rt 120
  fd :size
  pd
  piece :size
  pu
  rt 120
  fd :size
  pd
end
shape 50
shape 50

rt 30
to piece :size :n
  lt 60
  fd :size
  lt 120
  fd (:size * (:n+2))
  lt 120
  fd (:size * (:n+3))
  lt 60
  fd (:size)
  lt 120
  fd (:size * (:n+2))
  rt 120
  fd (:size * (:n))
  pd 
  pd
end
to shape :size :n
  piece :size :n
  pu
  rt 120
  fd (:size*(:n-1))
  pd
  piece :size :n
  pu
  rt 120
  fd (:size*(:n-1))
  pd
  piece :size :n
  pu
  rt 120
  fd (:size*(:n-1))
  pd
end
shape 20 7

Examples

The logo from the 'Uhh Yeah Dude' podcast is a crackingly good example:

Animated

External Links

• Wikipedia: Penrose Triangle