Ok kiddo, have you ever heard of something called Hajj? It's a really important pilgrimage that Muslims go on to a holy place called Mecca. And there's this really cool guy named Nasser Khalili who has a big collection of art that's all about Hajj and the things people use and wear while they are there.
So imagine you are going on a big trip - you need to pack your bags with things like clothes and toiletries, right? Well, people who go on Hajj also need to pack special things, like a white robe called an Ihram and a special belt called a money belt. They also carry something called a water vessel to drink from and cool off in the hot sun.
Now, when people go on Hajj, there are certain places they go and things they do. Nasser Khalili's art collection has lots of things that show these places and things. For example, he has pictures of the Kaaba, which is a big black cube in Mecca that people circle around, and he has models of the tents that people stay in while they are there.
Khalili's collection also has lots of beautiful calligraphy and artwork that has Quranic verses and religious sayings on them. These things are meant to help people feel more connected to their religion while they are on Hajj.
So, in summary, Nasser Khalili's collection is all about the things people use and see while they are on Hajj, and it has lots of cool artwork, pictures, and models that show what Hajj is all about.