You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Dwight_D._Eisenhower

Context:
After golf, oil painting was Eisenhower's second hobby. While at Columbia University, Eisenhower began the art after watching Thomas E. Stephens paint Mamie's portrait. Eisenhower painted about 260 oils during the last 20 years of his life to relax, mostly landscapes but also portraits of subjects such as Mamie, their grandchildren, General Montgomery, George Washington, and Abraham Lincoln. Wendy Beckett stated that Eisenhower's work, "simple and earnest, rather cause us to wonder at the hidden depths of this reticent president". A conservative in both art and politics, he in a 1962 speech denounced modern art as "a piece of canvas that looks like a broken-down Tin Lizzie, loaded with paint, has been driven over it."

Question:
What was the main type of oil painting painted by Eisenhower?

landscapes