Impossible Figure: 2011-05-31

As I spent most of May planning and going to the US this one got done really late! Luckily I was able to make a number of sketches during the flights and also while waiting in the airports.

Turns
2011-05-31

Linework | Fillwork

While the snaky path is perfectly horizontal there is a single vertical wall going from the start to the end and intersecting it at three places.