Dear brother daas ka daas,
we close our eyes to remember Allah, to think of Allah and we concentrate on the concepts given in Quran of Allah and etc. There are many veeses in Quran describing and praising Allah but the most concise and best is in chapter which says:
"Say He is Allah, one and only;
Allah, the Eternal, Absolute;
He begets not, Nor is He begotten;
And there is none Like unto Him.