The Fibonacciverse is a verse with a diameter of the (observable universe diameter in light years)-th Fibonacci number in light years, which roughly estimates to = F93,000,000,000 = 101010.28 light years in diameter. In the Fibonacciverse, objects can only be in the shape of the Fibonacci sequence. A object without this shape could make the entity or even the universe start falling down.
Objects, particles and distances can only be a Fibonacci number in size, length, volume, area and angle, with no exceptions. Thus, anyone and anything who attempts to enter the Fibonacciverse gets resized and reshaped (and possibly, stuck permanently).