Diplopia

Diplopia is an activated item added in Afterbirth.

Effect

 * Duplicates all pickups and pedestal items in the current room, then disappears.

Synergies

 * 20/20: Isaac fires 4 tightly-packed tears with no increase in tear delay.
 * Bob's Brain: Multiple Brains, similar to the Brains challenge.
 * Brimstone: Isaac fires two lasers simultaneously.
 * Contract From Below: Triples the drops upon clearing a room.
 * Dead Cat: 18 lives.
 * Dead Eye: The damage multiplier increases twice as fast, but still caps at double damage.
 * Dr. Fetus: Isaac fires two bombs simultaneously.
 * Eden's Blessing: Tears upgrades stack, and Isaac gains two items at the start of the next run.
 * Epic Fetus: Two missiles drop, one after the other.
 * Guillotine: Isaac will have two orbital heads, but only one will fire tears.
 * Gemini: Attaches two Sutures to Isaac, both of which deal damage.
 * Milk!: Taking damage will decrease Isaac's tear delay by 4 for the room.
 * Mom's Knife: Isaac fires two knives simultaneously.
 * Mutant Spider: Isaac fires 8 tears. Tears down do not stack.
 * Pentagram: Further increases damage and increased chance for devil deals.
 * Steam Sale: All items in shops become free. With Restock, items can be infinitely bought for free.
 * Technology: Isaac fires two lasers simultaneously.
 * The Inner Eye: Isaac fires 6 tears. Tears down do not stack.
 * The Ludovico Technique: A smaller tear orbits the main tear.
 * The Wiz: Isaac fires 4 tears diagonally.
 * Tech X: Isaac fires two laser rings simultaneously.

Interactions

 * 9 Volt: No effect.
 * A Lump of Coal: No effect.
 * BFFS!: No effect.
 * Cambion Conception: No effect.
 * Car Battery: No effect.
 * Cricket's Body: No effect.
 * Eve's Mascara: The damage and tear multipliers do not stack. The shot speed does stack.
 * Godhead: No effect on halo size or damage.
 * Habit: No effect.
 * Holy Mantle: No effect.
 * Humbling Bundle: No effect, as pickups do not have tripled or quadrupled variants.
 * Ipecac: No effect.
 * Key Piece 1: Spawns another Key Piece 1, not Key Piece 2.
 * Key Piece 2: Spawns another Key Piece 2, not Key Piece 1.
 * Loki's Horns: No effect.
 * Mom's Purse: No effect.
 * Monstro's Lung: No effect.
 * Polyphemus: No effect.
 * Proptosis: No effect.
 * Purity: No effect. Aura Changes after second Pickup.
 * Sacred Heart: Further decreases tears and shot speed with no increase in damage.
 * Tarot Cloth: No effect.
 * Tech.5: No effect.
 * The Battery: No effect.
 * The Parasite: No effect.
 * There's Options: No effect.
 * Money = Power: No effect.
 * ? Card: Expends both the card and the item with no additional benefit.

Trivia

 * Diplopia is the simultaneous perception of two images of a single object, commonly referred to as double vision.

Seeds
71A9 QSS2 (First floor shop) HK2C L3NZ (First floor shop)