I present Oskar puzzle - Hollow Mystery
with the permission of Oskar from his drawings I made the Hollow Mystery. this is a very interesting and rare puzzle.
if your collection does not have this - it's a great chance to get a wonderful puzzle !!!

Description of the author:
Hollow Mystery is a hollow Jaap's Sphere version of Rocket Twist, illustrating its unique geometrical properties. The puzzle has three squares, four triangles and three "diangles" wrapped around a sphere. At its initial state, the puzzle has three rotation axes, each 10.8122 degrees north of the equator, and equally spaced around the north-south axis. The puzzle has three main cuts, which is the south pole revolved around each of the three rotation axes. Hence the three cuts intersect at 120 degrees at the south pole. One of the triangles is centered at the north pole. The other three triangles are surrounding the south pole, bound by the three main cuts and three stored cuts. Hollow Mystery has the unusual property that its rotation axes are not stationary, but they move around. When one side is rotated by 144 degrees over rotation axis no.1, then rotation axis no.2 remains, but rotation axis no.3 disappears. This is usual behaviour for a jumbling puzzle. However, when next a rotation of a side is made by 144 degrees over rotation axis no.2, then rotation axis no.3 reappears at a different location, at 72 degrees from its original location. With other combinations of rotations, also axes no.1 and no.2 moved around the sphere. The puzzle is definitely a jumbling puzzle, as it cannot be unbandaged into doctrinaire puzzle. The puzzle is also definitely quasi-doctrinaire, as any state of the Rocket Twist (or Hollow Mystery) is at most one turn away from a "rocket-shape" state. It is undetermined whether the puzzle is deeper-than-origin, as the moving-around of axes happens both when the puzzle is played shallowed-than-origin and deeper-than-origin.

puzzle on the photo and video-presentation may differ slightly from this puzzle
forum link - http://twistypuzzles.com/forum/viewtopic.php?f=15&t=34784
youtube review video from Author - https://www.youtube.com/watch?v=O1i2akNpLjk

my review video (turning demonstration) -

Edge size - mm , Height - , weight -

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I can make and send you this puzzle after your order and payment within 30-60 days (term depends on the supplier of 3D printing).
Delivery to any country in the world with tracking number. Available Combined shipping - you can order several puzzles to get a small discount or Free Shipping.

You need to understand: this puzzle is hand-made.
The plastic is printed on 3D-Printer from SLS-nylon, completely polished and painted. Stickers are made of Oracal film.
This puzzle is different from the products in mass production from the store.
You can also play with it many times, but you must remember that this is a fragile product.
You get a fully assembled puzzle - this is an excellent specimen for the collection!