Trying to assign to an un-named type

Hmm. I think it's doing the right thing - maybe Rick can say for sure.

It fails because of writing display.clear - because there's already Graphics.prototype.clear.

There are some other things though:

• It's best to leave off the fillRect function. If you don't supply it, Espruino will use its own (which will be native code and so faster).
  
• I'd really recommend that in this case you use Graphics.createArrayBuffer because it'll be faster/more efficient. I'm planning on adding rotation to Espruino at some point - but for now you could do rotation more efficiently in a flip function anyway :)