GULL C4LL.                            
  
                                          
 TH3  S34GULL 1S  4 M3T4PHYS1CS TR1CK;  4 
 WORLD-BU1LD3R'S SHORTCUT,  TO  D3F1NE  4 
 S3CT1ON  OF R34L1TY 4ND  1MPLY 1TS S1Z3: 
 PL4C3 4 FLOCK OF B1RDS  4T TH3 3DGE  4ND 
 M4K3  TH31R  C4LLS  T3SSEL4TE  OV3R  TH3 
 3NT1RE VOLUM3                            
                                          
 4  S34GULL C4N  B3  D3F1NED BY 4S L1TTL3 
 4S  F1V3  V3RT1CES;  S1X  TR14NGL3S.  (1 
 WOULD  R3COMMEND  H4NDL1NG  1N SW4RMS OF 
 4T L34ST 4 DOZ3N B1RDS.)