For me, the 4 parts each induces an autostereogram. There isn't any pseudo-3D figure in each image, but 3D emerges from each gradient-based square.
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本っっっ当に恐縮です。わたし実力全然なくて、まぐれで出来たものでした。北岡先生の鋭いご指摘がなければ、何もなかったと言ってもよさそうなものです。
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