Kahlil Gibran

Hello,

Q1. Are Kahlil Gibran's writings poems or essays, or anything else? For example, his writing named Sand and Foam.

Q2. Did he mostly write in English or Arabic? For example, was Sand and Foam originally written in English?

Q3. Are his writings popular or well-known in English-speaking countries, especially in the US? He was a Lebanonese American.

Thanks!