This is a very interesting experiment, but I was wondering if the dice rolling was sufficiently natural / random. The can automatically rotates at 90 degrees, b

This is a very interesting experiment, but I was wondering if the dice rolling was sufficiently natural / random. The can automatically rotates at 90 degrees, but when it comes back up, the dice seems to spin a lot on the vertical axis, showing bias towards the upper half of the faces. However, I did not see what effect the first half of the motion had on the dice.