How is the number / tetris code in Fez intended to be solved?

Tetromino/Tetris block cipher

Controller inputs are only associated with tetrominos once.

Where?

Towards the top of the map, in the tree near the octopus building that houses the solar system model.

What's inside?

A puzzle that displays tetromino blocks based off of controller inputs, and an anticube prize for cracking the nearby pillar's code. (image) (link to finished cipher)

The classroom in the 8-cube Blade Runner city then shows how to interpret the pillars with tetromino inscriptions. Here's one wall, but relate it to the others:

Numbers cipher

Like the alphabet, there isn't one proper way to do this, but you might be interested in the 16-cube temple's classroom. Instead of trekking back, this is what it looks like:

Hint:

Those are "equals" signs, and the last picture is arithmetic. Also, the figure/ground is confusing—pay attention to the box and its internal vertical/horizontal lines, not the "C" shapes. (link to finished cipher)

For the tetris shapes:

There is a room where a pillar flashes the appropriate shape when you apply the input near it. There's a tetris-shaped chain next to it to test the inputs on. It looks like this: http://i.stack.imgur.com/pfnDd.png

It was really satisfying to figure that one out for myself, I loved that puzzle.

For the numbers:

The numbers are in order on a wall (in the big-head village I think), and 1-4 are on connected treasure maps.