Toyota visionary Tetsuya Kaida says cars built of plant-based materials may be in showrooms within 15 years. "I want to create such a vehicle from seaweed because Japan is surrounded by the sea. This is my dream," he says. He has also dreamed up a transparent car that "aligns with the driver's psychological state" and has "mood-training steering control." See photos of these far-out concept cars here.

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