They should have made a picture that looked obviously obscene and covered the suspicious bits with those purple blocks. That way, even as people answered questions, they would be uncomfortable while doing so, uncertain as to whether they should be encouraging Yoshida's sick (final) fantasies.
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"... he called to himself a wizard, named Gallery, hoping by this means to escape the paying of the fifteen hundred crowns..." (Machen 15) "Thus opium is pleasing... on account of the agreeable delirium it produces." (Burke para.6) "I could only read so much for this paper and the syphilis poem had to go."