Hive five is a reaction where an instant V sparkhits a pair of beehives, which reform transparently. Paul Callahan originally discovered the reaction on December 24, 1998.
Periods with known compatible sparkers are 32,[1] 41,[2] 46, 64, 72, 73, 84,[3] and 126.[4]Herschelfactory-based loop oscillators can be constructed for any period 63 and above.[5]