A %%ot [ter'angreal|Angreal]%%, a large formation of glass columns. It sits in the center or [Rhuidean]. Walking through the glass columns presents historical visions from the [Breaking] and the [Age of Legends] through the eyes of ones ancestors. It is used as a test for [Aiel] men who wish to become clan chiefs and women to become [Wise Ones|Aiel]. Only one in four men survive the test. 

! References (Possible Spoilers)

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# In [The Shadow Rising]
## [TSR,Ch24] - [Rand] enters the glass columns.
## [TSR,Ch25] - [Rand] sees the history of the [Aiel] in the glass columns. [Muradin] is also there.
## [TSR,Ch26] - [Rand] sees the history of the [Aiel] in the glass columns. [Muradin] does not survive.
## [TSR,Ch34] - [Rand] assumes that [Aviendha]'s anger towards him came from what she saw in the glass columns.
## [TSR,Ch48] - [Bair] tells [Rand] that [Aviendha] did not go through the glass columns.
# In [The Fires of Heaven]
## [TFoH,Ch7] - The glass columns are the second test for [Wise One|Aiel] apprentices. More women survive the test than men, but the [Wise Ones|Aiel] do not agree on the reason.
# In [The Gathering Storm]
## [TGS,Ch26] - After claiming her right as a [Wise One|Aiel], [Aviendha] leaves for [Cold Rocks] Hold, then [Rhuidean] where she will traverse the glass columns.
# In [Towers of Midnight]
## [ToM,Ch45] - [Aviendha] arrives at [Rhuidean]. She will enter the glass columns tomorrow.
## [ToM,Ch48] - [Aviendha] completes her trip through the glass columns. She touches the glass columns to use her Talent of reading %%ot [ter'angreal|Angreal]%% and inadvertently begins a second trip, this time through the future.
## [ToM,Ch49] - [Aviendha] completes her second trip through the glass columns and is devastated by what she saw.
# In [A Memory of Light]
## [AMoL,Prologue] - [Bair] Travels to [Rhuidean] to traverse the glass columns to see if she sees the same future as [Aviendha].
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