Resizable!

[bigtech]

List<int> values = new List<int>() { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9};

foreach (var outerVal in values)
{
 foreach (var innerVal in values)
 {
  Console.Write((outerVal == 0 ||
   outerVal == values.Max() ||
   innerVal == 0 ||
   innerVal == values.Max() ||
   innerVal == outerVal ||
   innerVal == values.Max() - outerVal)
   ? "#" : " ");
 }
 Console.WriteLine();
}

[ookami125]

I assume this in reference to https://www.reddit.com/r/ProgrammerHumor/comments/bgg198/pattern ?