Near it sits a lens-shaped or lenticular galaxy called IC 4970, which appears to have crashed through the spiral in recent astronomical times.

BBC: Galaxy crash sparks biggest spiral

The structure's cone-like shape was designed to reduce wind turbulence, yet there is only one piece of curved glass on the building: a lens-shaped cap at the very top.

FORBES: Magazine Article

As the light rays pass through this odd-shaped lens, they are distorted.

ECONOMIST: MONITOR

Then he discovered a new Japanese method of cutting diamonds: When viewed under a low-magnification (3x) lens, the stone refracted light in such a way as to give off a pattern of eight heart-shaped sparkles at the bottom of the diamond and eight arrow-shaped fire-bursts through the top--hence the name "hearts-and-arrows" diamonds.

FORBES: Stones on fire