Cozy reading nook a teacher created with a refrigerator box and floor pillows. I think this idea could be built upon to create an inexpensive Cozy Reading Nook for an apartment that could be altered to appear legitimate.
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Simple stack of multiple fabric-covered foam pads. makes a cushy "sofa" in the playroom, and can be pulled apart for multiple sleepover guests, movie night pillows, or tumbling games, etc. (they have fabric covered foam mattresses at Jysk)