You cannot be fully immersed within your game if you're playing space is not decked out with video game furniture. It will take it to the next level and make it a part of your life even after the pause button is pressed.
Most video game furniture designs might be a little childish looking for grown adults, but sometimes designers pull off magical pieces that are quite stylish. Sometimes they are even subtle enough that your girlfriend may let you decorate them in other parts of the house other than your man cave.
One of my favorite pieces of gamer furniture is the one that mimics a NES console and is also functionally capable of being included into your game. It's the table of any vintage gamer's dream.
22 Pieces of Video Game Furniture
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Awesomely Geeky Gamer Lamps
Interactive Gamer Lighting
Game-Centred Coffee Tables
Nerdy Tetris Sofas
8-Bit Video Game Tables