CFTP for conditioned Ising model: current cycle on left, most recent construction of perfect sample on right, key to colour coding at bottom.

Key:

• Evolving image (on left) : largest and smallest simulations agree in producing output code -1;
• Evolving image : largest and smallest simulations agree in producing output code +1;
• Evolving image : largest and smallest simulations do not agree;
• Most recent output image (on right) : largest and smallest simulations agree in producing output code -1, and this agrees with observed image;
• Most recent output image : largest and smallest simulations agree in producing output code -1, and this does not agree with observed image;
• Most recent output image : largest and smallest simulations agree in producing output code +1, and this agrees with observed image;
• Most recent output image : largest and smallest simulations agree in producing output code +1, and this does not agree with observed image;
• Most recent output image : largest and smallest simulations do not agree, and observed image has code -1;
• Most recent output image : largest and smallest simulations do not agree, and observed image has code +1.