You might want to double-check your attic the next time you do some spring cleaning. A small floral bowl bought at a yard sale near New Haven, Connecticut for just $35 has been identified as a rare 15th-century Chinese antique. It’s now expected to sell for between $300,000 and $500,000 next month, according to Sotheby’s auction house. Experts say the “lotus bowl” originated from the court of the Yongle Emperor, who ruled from 1403 to 1424. Only six other similar bowls are known to have survived; one is housed at the National Palace Museum in Taipei.