Why can't you place two dice next to each other so that the visible sides opposite each other have the same number?

For example, if I place two dice next to each other at the threes, I see two ones on the top side and two sixes on the bottom. However, the fives and twos don't follow this pattern. Why is that?

Dice?

What is the maximum number of sides of a cube that can be seen at once? We're discussing this in class right now, and we're not sure whether it's 4 or 5.

How do I ensure the same brightness of all LEDs on the LED Cube?

Hi everyone, I want to build a 7x7x7 LED cube and have built a 3x3x3 LED cube on Tinkercad for testing. Unfortunately, my electrical engineering knowledge is quite limited, so I need help: Since my program only controls the LEDs temporarily and not continuously, they flicker or shine dimly. This depends on the time between…