01 — The company
MORTADELA j.d.o.o. is a small company in Zagreb.
It is registered at Ulica Ivane Brlić-Mažuranić 1b, and Neven Hodalić answers for it. The name and the mark are a delicatessen's; what this page can vouch for is the entry in the register, a mailbox somebody actually opens, and one calculation carried out to the end.
There is no shop counter here and no catalogue, because a page is a poor way to sell anything that has to be weighed, sliced or tasted. What follows is laid out the way a counter is: the particulars on one side, the one thing on the shelf on the other, and a demonstration across the middle.
02 — The company's particulars
Who is answerable, and where.
Correspondence about the firm goes to ured@mortadela.site; anything about the app or this website goes to plima@mortadela.site. Letters reach Ulica Ivane Brlić-Mažuranić 1b in Zagreb. One person opens both boxes, so a plain sentence about what you need will get further than a form.
03 — The register
04 — On Google Play
One app, and nothing to do with lunch.
Akvarij is a logic puzzle: a wall of glass tanks, numbers down the side, and water that insists on lying flat. It opens no connection, keeps no account and sells nothing inside itself.
05 — One measurable thing
Gravity is worth more than any clue on the board.
Put sixty-four cells on a wall and let each one be wet or dry as it pleases, and there are more arrangements than there are seconds in four hundred billion years. Now insist only that water falls — that no cell can hold water with a dry cell beneath it inside the same tank — and almost all of them vanish. Not most: almost all. The glass dividers decide how much is left, and the extremes of that are worth seeing.
Click between two rows to set a divider · 1 of 7 in place
Split each column in half and the wall drops from eighteen quintillion arrangements to a hundred and fifty-two billion — about 121 million times fewer. One rule about water did that, before a single clue number was read.
A tank of height h holds water at one of h+1 levels and nowhere else, so a column divided into tanks has ∏(h+1) arrangements rather than 2⁸, and a wall of eight such columns has that figure to the eighth power. The page multiplies it out in whole numbers; the counting was separately checked by generating all 256 wet-and-dry patterns of a column and keeping the ones water would actually hold, for every one of the 128 ways the dividers can fall, and the two agreed every time. Two extremes are worth noting: with no dividers at all the wall holds 9⁸ = 43 046 721 arrangements, and with a divider between every pair of rows it holds exactly 2⁶⁴ — the same as if water did not fall, because a tank one cell tall has nothing to pour into. Absent by design: there are no clue numbers here, no puzzle, no solution and no second column. This counts what water permits; working out which single arrangement the numbers demand is a different pleasure, and it is not served at this address.