Sentence:  The pictures on these cards which I am going to show you are such ink-blot pictures. They do not really represent anything. They are accidental <WSD>blottos</WSD>. All you have to do is to look at them one by one and tell me what they might be, what they could represent for you. 
Meaning of the word marked with <WSD> tags:  An artwork created using blots of ink or paint.