Mahjong
Stacking tiles

Each player then stacks a row of 18 tiles, two tiles high in front of them (for a total of 36 tiles). Players then push each side of their stack together to form a square wall.

Regular players usually place their stacks in a slightly diagonal position (about 20 to 30 degrees counter-clockwise); the right end of their stack is pushed slightly further in to the centre of the table to meet almost the middle of the stack of the player on the right. This creates a smaller square wall the length of about half of each stack, with walls extended away from each corner of the square. The diagonally positioned stacks and a smaller square creates a bigger space for players' tiles and also makes an ergonomic position for drawing tiles from the stack.
combination:two_responses, oulipo:avoid_letter[e]