Double twist in Marble,... The ball is formed by 4 spirals that turn around each other. The ring has a triangular profile and is twisted over 120 degrees thus giving a continuous surface like in a mobius strip. only in this case without sides.
Double twist in Marble,... The ball is formed by 4 spirals that turn around each other. The ring has a triangular profile and is twisted over 120 degrees thus giving a continuous surface like in a mobius strip. only in this case without sides.