Mine

~$ cat sier.c
#include <stdio.h>

int main() {
  int a=1<<10;
  while(a--){putchar(040+0b11*!((a^((a>>5)&a))&037));if(!(a&0x1F))putchar('\n');}
}

~$ ./sier 
################################
 # # # # # # # # # # # # # # # #
  ##  ##  ##  ##  ##  ##  ##  ##
   #   #   #   #   #   #   #   #
    ####    ####    ####    ####
     # #     # #     # #     # #
      ##      ##      ##      ##
       #       #       #       #
        ########        ########
         # # # #         # # # #
          ##  ##          ##  ##
           #   #           #   #
            ####            ####
             # #             # #
              ##              ##
               #               #
                ################
                 # # # # # # # #
                  ##  ##  ##  ##
                   #   #   #   #
                    ####    ####
                     # #     # #
                      ##      ##
                       #       #
                        ########
                         # # # #
                          ##  ##
                           #   #
                            ####
                             # #
                              ##
                               #