ocr: 1. Pushing objects The fish are only in danger when they move some object. The simplest situation is lifting objects - there is no danger in it. If the fish on the left picture moves up, it lifts the object. If it moves left or right, nothing happens, but the object stays in place; if it goes on moving left or right long enough, it will eventually come out from under the object and the object will fall harmlessly down. The only dangerous direction is down. Ift the fish moves down, the object it was supporting will fall on it and kill it. Ift the fish want to push an object, the object must be ...
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