This light was designed by manipulating the wavelengths of the spectrum!
The gold leaf on the shades of this lamp, produced by Ingo Maurer, is beaten to a thickness of 1/10,000th mm, corresponding to 1,000 atomic layers. This allows short wave blue light to pass through the molecules whereas longer wave yellow-gold light is reflected. Therefore, the inner surface of the lamp appears gold when lit, the outer surface appears blue.
Until next time