title: How to spawn in loop like snail but in square
body: <p>Hello I am French so excuse my bad English please,
  I created a generation of land with a seed with prefabricated gameobjects but they spawn from column to column so I would like to create this but starting from the center to outside like a snail but in square</p>
  <p>I partially succeeded, the first image shows the generation in columne but also the desired final result with the generation in snail and the second shows what I managed to do therefore in snail but my pieces of land are square it looks bad</p>
  <ul>
  <li>First:<br />
  <a href="https://i.stack.imgur.com/dHZrb.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dHZrb.png" alt="1" /></a></li>
  <li>Second:<br />
  <a href="https://i.stack.imgur.com/kICF9.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/kICF9.png" alt="2" /></a></li>
  <li>It works like:<br />
  <a href="https://i.stack.imgur.com/SVHg2.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/SVHg2.png" alt="3" /></a></li>
  <li>And I want it Work like:<br />
  <a href="https://i.stack.imgur.com/y99i6.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/y99i6.png" alt="4" /></a></li>
  </ul>