The University of Nebraska-Lincoln Department of Mathematics has 2020 shirts for sale through Oct. 8, with two options available. The graphic shows the state outline, filled with a tiling by Sir Roger Penrose, modeled after the wooden wall piece in Avery Hall constructed by Earl Kramer, artist and emeritus professor of mathematics. The back features the absolute value of x and encourages all us to stay positive and happy during these trying times.
All orders will be shipped to you directly. Order at: https://pogo.undergroundshirts.com/collections/2020-mathematics-department-t-shirt
Once the online order form closes on Oct. 8, then all orders will be processed. Orders will ship out on Oct. 23. The form will not be reopened so you must order on or before Oct. 8 at midnight EST.
http://www.math.unl.edu/friends