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A hub with cyclic group of symmetry of type C4. We can compare it with another hub; or w...
A bag produced by the Mozambican handicraft with some beautiful examples of friezes. From...
From the point of view of topology, this wooden sculpture represents a three components li...
The figure eight knot (also called the savoia knot) is the simplest knot after the trefoil...
Two double-tied circumpherences, (the Solomon's knot).The image has been realized with the...
This sculpture in via Lange Reihe 8 in Cologne has the shape of a Moebius strip. See it fr...
The theorem of classification of the surfaces states that any compact, connected, orientab...
On the fountain of the Castello Sforzesco in Milan, there's a coat-of-arms that should rep...
The three-components knot represented in this diagram has the same "shadow" of the Borrome...
