Compound four tetrahedra

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The most famous building in Kazan (city in Russia) and its main symbol is Tower Syuyumbike. It is...

The founders of the town called Mirniy, situated in Russia in Arkhangelsk region, put an image of...

  The Kepler's Star (nor Keplerstjernen), 45 meters high, is located near Oslo in the vicinity of...

Quite often a question about a practical use of paper models pops up.  What is the point of paper...

The “business card” of the Republic of Belarus is a new building of the National Library in Minsk. The...

In natural environments regular polyhedra can be found in the form of crystals (minerals). Sodium...