The single sprite contain two costumes: 1. is a 40x40 square framed by 1 pixel wide lines of different colors. 2. is a 40x40 square framed by 2 pixel wide lines of different colors. To the left is the pen stamped version of these costumes (initially 1). To the right is the sprite version of the same costume. Both with size set to 100%. You will notice that they look different. It seems that the pen stamps in a minimum of 2x2 pixels, and ignores the odd rows and columns in the costume bitmap (assuming the top left pixel is 0,0). Click the sprite to switch costumes (1 & 2 line width). Click stop to see a zoomed screen dump of the difference using costume 1. I'm sure I'm not the first to notice this, but this project helped me to understand this shortcoming in the pen stamp.
