Let's say you want to avoid the colour red. You remove every possible thing red which is in front of you. You change the colour of your clothes, remove that red tomato ketchup you so love with your spaghetti, remove the red coasters, the red coloured pens and every thing remotely red which is in front of you. Even if someone mentions the colour, he is snapped shut. But tomorrow you pluck a yellow rose instead of your favourite red one and hurt yourself with a thorn. What will you do about the red blood which oozes out?