The Years of the Trees: Nerdanel the Wise
Now the Three Kindreds of the Eldar were gathered at last in Valinor, and Melkor was chained. This was the Noontide of the Blessed Realm, the fullness of its glory and its bliss, long in tale of years, but in memory too brief. In those days the Eldar became full-grown in stature of body and of mind, and the Noldor advanced ever in skill and knowledge; and the long years were filled with their joyful labours, in which many new things fair and wonderful were devised.
— The Silmarillion, Of Fëanor and the Unchaining of Melkor
for @feanorianweek, 2018.